Answer: chimpanzees
Explanation:
The earliest evidence of ancestral hominin are found in the middle pleistocene deposits in kenya, Africa. Pleistocene showed to have the earliest occurrence of about 2 million years ago.
What are evidences of ancestry?
Fossils, anatomy, embryos, and DNA sequences provides the line of evidence about the common ancestry of today's organisms. It provides evidence of more closely related organisms having more characteristics in common. DNA sequences underlies the similarities and differences in the fossils, anatomy, and embryos of human population.
The hominin fossil record is found in the Pleistocene is increasingly well documented. One species for which there is substantial new information is Homo erectus which are found in the deposits of Kenya, Africa.
Homo erectus is an extinct species of archaic human race from the middle Pleistocene, with its earliest occurrence about 2 million years ago.
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A sequence of amino acids called a. Which is produced during the process of
The process of protein synthesis, a polypeptide—a group of amino acids—is created. Transcription and translation are the two fundamental processes that take place during protein synthesis in cells
. The DNA sequence of a gene is converted into a messenger RNA (mRNA), a complementary RNA molecule, during transcription. The translation process uses the mRNA as a template to assemble the amino acids into a polypeptide chain. The correct amino acids are delivered to the ribosomes by transfer RNA (tRNA) molecules, where they are linked together in accordance with the arrangement of codons on the mRNA. In the end, this procedure results in the creation of a functioning protein made up of one or more polypeptides.
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The transcript is most certainly larger than the other versions during alternative splicing that undergoes:
intron retention
alternative promoters
PIC exclusivity
none of these
The transcript is most certainly larger than the other versions during alternative splicing that undergoes intron retention. The correct option is A.
Alternative splicing is a process that produces different transcripts from a single gene by selectively including or excluding exons or introns. Intron retention is one of the alternative splicing mechanisms in which a pre-mRNA transcript retains one or more introns, resulting in an elongated transcript.
The retained introns are typically located towards the 5' or 3' end of the transcript. Alternative promoters and PIC exclusivity are other alternative splicing mechanisms that can produce different transcripts, but they do not necessarily result in larger transcripts.
Therefore, the transcript is most certainly larger than the other versions during alternative splicing that undergoes intron retention. Correct option is A.
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when you direct a light into one eye, did the opposite eye also respond by constriction of the pupil?
When light is directed into one eye, both eyes will respond with constriction of the pupils due to the consensual light reflex. This reflex is a protective mechanism of the eyes to regulate the amount of light entering the eye and maintain clear vision.
The light entering one eye stimulates the photoreceptors in the retina, which sends a signal via the optic nerve to the brainstem. The signal is then transmitted to the Edinger-Westphal nucleus, which controls the muscles of the iris, causing constriction of the pupils in both eyes. Therefore, even though the light is only directed into one eye, the constriction of the pupil occurs in both eyes due to the consensual light reflex.
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Arrange in chronological order the evidence that life transitioned from aquatic environments to aquatic and terrestrial environments. Only aquatic organisms Dry land was devoid of signs of life, even as organisms diversified in the sea. Microbial mats left remains on land rocks. The oldest fungi left behind fossil evidence. Spores were embedded in plant tissues. Early invertebrates, such as insects or spiders, left tracks on beach dunes. The first fossil of a fully terrestrial animal surfaced. A tetrapod left tracks that fossilized.
The chronological order of evidence for the transition from aquatic to terrestrial environments is as follows:
1. Only aquatic organisms existed, with dry land devoid of signs of life while organisms diversified in the sea.
2. Microbial mats began to leave remains on land rocks.
3. The oldest fungi left behind fossil evidence on land.
4. Spores were embedded in plant tissues, indicating early land plants.
5. Early invertebrates, such as insects or spiders, left tracks on beach dunes.
6. The first fossil of a fully terrestrial animal surfaced.
7. A tetrapod left tracks that fossilized, showing the emergence of early four-legged land animals.
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2. Imagine that a drug interacts with baroreceptors, causing them to increase their firing rate. What would you expect to be a result of taking this drug?A. The drug would be protective against hemorrhageB. The drug would raise heart rateC. The drug would raise blood pressureE. The drug would lower blood pressure
If a drug interacts with baroreceptors, causing them to increase their firing rate, the most likely result would be an increase in blood pressure.
If a drug interacts with baroreceptors, causing them to increase their firing rate, the most likely result would be an increase in blood pressure (option C). Baroreceptors are specialized sensory receptors that are located in the walls of certain blood vessels and in the heart. They detect changes in blood pressure and send signals to the brain to regulate it. By increasing their firing rate, the drug would stimulate the baroreceptors to send stronger signals to the brain, which would then activate mechanisms to increase blood pressure. This could involve increasing heart rate, constricting blood vessels, and increasing the force of heart contractions. However, it's important to note that this hypothetical drug would not be protective against hemorrhage (option A) because hemorrhage involves a loss of blood volume, which would not be affected by the drug's action on baroreceptors. It's also unlikely that the drug would lower blood pressure (option E) because its mechanism of action would be to increase it.
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a mistake during segregation of chromosomes is called select one: a. deletion. b. duplication. c. nondisjunction. d. point mutation. e. aneuploidy
A mistake during the segregation of chromosomes is called nondisjunction. Nondisjunction occurs when chromosomes fail to separate properly during cell division, resulting in daughter cells with an abnormal number of chromosomes.
Nondisjunction occurs when chromosomes fail to separate properly during cell division, resulting in daughter cells with an abnormal number of chromosomes. This can lead to aneuploidy, which is the presence of an abnormal number of chromosomes in a cell, such as trisomy 21 (Down syndrome) which is caused by the presence of an extra copy of chromosome 21 due to nondisjunction during meiosis. Nondisjunction can occur during both meiosis I and meiosis II. It can also occur during mitosis, leading to mosaicism, a condition where an individual has two or more genetically distinct cell lines in their body.
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true/false. FDR believed that businesses would be hurt by the loss of the NRA and would exert pressure for a new version of the NRA
The given statement "FDR believed that businesses would be hurt by the loss of the NRA and would exert pressure for a new version of the NRA" is True.
Franklin D. Roosevelt (FDR) believed that the National Recovery Administration (NRA) had been successful in improving business conditions during the Great Depression by setting industry-wide codes for fair competition and labor standards.
However, the Supreme Court declared the NRA unconstitutional in 1935, and FDR did not pursue its reauthorization.
Instead, he believed that the loss of the NRA would cause businesses to suffer and eventually exert pressure for a new version of the NRA that would establish similar industry codes.
FDR's prediction was partially correct, as some industries did create voluntary codes of fair competition after the NRA's demise, but they were not as effective as the NRA's codes and did not have the same level of government support.
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During early Drosophila development, the zygote undergoes many rounds of _____________.
A) holoblastic cleavage
B) implantation
C) mitosis, but not cytokinesis
D) meroblastic cleavage, with each cell asymmetrically smaller than the next
During early Drosophila development, the zygote undergoes holoblastic cleavage, dividing the cytoplasm and creating smaller cells.
During early Drosophila development, the zygote undergoes a process known as holoblastic cleavage. This process involves the division of the cytoplasm and creates smaller cells, each containing a nucleus.
The cells continue to divide in a rapid and repetitive manner, creating a large number of cells that will eventually differentiate and form the different organs and tissues of the developing embryo.
Unlike meroblastic cleavage, which occurs in organisms with yolk-rich eggs, the division of the Drosophila zygote is symmetrical and each cell is of a similar size.
This process is essential for proper embryonic development and sets the stage for subsequent cell differentiation and growth.
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During early Drosophila development, the zygote undergoes many rounds of mitosis, but not cytokinesis.
Mitosis is the process of cell division that results in the production of two daughter cells that are genetically identical to the parent cell. Cytokinesis, on the other hand, is the physical separation of the two daughter cells, which occurs after the completion of mitosis.
The phrase "undergoes many rounds" suggests that the process being described is not a one-time event. Holoblastic and meroblastic cleavage are early stages of embryonic development in which the zygote undergoes a series of cell divisions to form a blastula. Implantation is the process by which the blastocyst, a later stage of embryonic development, attaches to the uterine wall.
Therefore, the correct answer is C) mitosis, but not cytokinesis, which suggests that the cells are undergoing repeated rounds of division without separating into distinct daughter cells. This is a common process in embryonic development and can lead to the formation of a multicellular organism from a single cell.
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Inhibitors of bacterial translation, such as chloramphenicol and erythromycin, usually... (Select all that apply.) inhibit mitochondrial protein synthesis. inhibit chloroplast protein synthesis. have no effect on mitochondrial protein synthesis. have no effect on chloroplast protein synthesis. inhibit eukaryotic cytoplasmic protein synthesis. 2.5 pts
Inhibitors of bacterial translation, such as chloramphenicol and erythromycin, usually:
A, inhibit mitochondrial protein synthesis, and D, have no effect on chloroplast protein synthesis. E, inhibit eukaryotic cytoplasmic protein synthesis.What is bacterial translation?Bacterial translation is the process by which ribosomes in bacteria synthesize proteins using messenger RNA (mRNA) as a template, which involves the decoding of genetic information from DNA into a sequence of amino acids that form the primary structure of a protein. It consists of three main stages: initiation, elongation, and termination.
During initiation, the ribosome assembles on the mRNA molecule and identifies the start codon, which codes for the first amino acid of the protein.
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True or FalseFrom birth to death the microbiome of a human is relatively the same.
From birth to death the microbiome of a human is relatively the same is true because the microbiome of a human undergoes significant changes throughout their life, influenced by various factors such as diet, medication use, environmental exposures, and aging.
The microbiome of a human undergoes significant changes throughout their life, influenced by various factors such as diet, medication use, environmental exposures, and aging.
The composition and diversity of the microbiome can vary widely from infancy to old age, and can also be impacted by disease or other health conditions.
Additionally, the microbiome can be affected by external factors such as antibiotics, which can disrupt the balance of microbial populations in the body.
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cells migrate from one place to another during gastrulation using
Cells migrate from one place to another during gastrulation using a process called cell migration or cell movement.
This is driven by various molecular mechanisms, including changes in cell adhesion, cytoskeletal dynamics, and signaling pathways. Some specific mechanisms involved in cell migration during gastrulation include epithelial-to-mesenchymal transition (EMT), in which cells lose their epithelial characteristics and acquire mesenchymal properties, and chemotaxis, in which cells follow gradients of signaling molecules to reach their destination. The specific mechanisms involved in cell migration can vary depending on the type of cells and tissues involved.
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during which phase of the meiotic cell cycle does the amount of dna inside of the cell double
During the S-phase(Synthetic Phase) of the meiotic cell cycle, the amount of DNA inside of the cell doubles through DNA replication.
In this phase, DNA replication occurs, resulting in the duplication of each chromosome and the formation of sister chromatids. This doubling ensures that there is enough genetic material for the subsequent meiotic divisions to produce haploid gametes. During the cell cycle's S phase, also known as synthesis, DNA that has been packaged into chromosomes is replicated. Due to the fact that replication enables each cell produced by cell division to have the same genetic make-up, this event is an essential component of the cell cycle. More than just chromosome replication takes place during the S phase. During the S phase, cell growth and the rate of synthesis of various DNA-synthesis-related proteins and enzymes continue. Once DNA replication is complete the cell contains twice its normal number of chromosomes and becomes ready to enter the phase called G2.
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During the S-phase of the meiotic cell cycle, the amount of DNA inside the cell doubles.
The S-phase is a period of DNA synthesis and replication. In meiosis, the S-phase occurs during the interphase between the first and second meiotic divisions. During this phase, DNA replication occurs, resulting in the formation of two identical sister chromatids that are held together by a centromere. These sister chromatids will later separate during meiosis II, resulting in the formation of haploid daughter cells. The doubling of DNA content in the S-phase is essential for meiosis to occur correctly, as it ensures that each daughter cell receives a complete set of genetic information. The timing of the S-phase is tightly regulated to ensure the fidelity of DNA replication and to prevent errors in chromosome segregation.know more about meiotic cell cycle here: https://brainly.com/question/30421033
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2) (1 pt) Lactose is a monomer composed of galactose and glucose. True or False?
3) (1 pt) The presence of glucose facilitates the formation of CAP-cAMP complex, and this in turn allows the RNA polymerase to bind and initiate transcription of the lac operon. True or False?
(1 pt) True.
Lactose is a disaccharide composed of galactose and glucose monomers. When lactose is broken down by the enzyme lactase, it is hydrolyzed into its component monosaccharides, galactose and glucose.
(1 pt) True.
In the absence of glucose, the lac repressor protein binds to the operator region of the lac operon, preventing RNA polymerase from binding and initiating transcription of the structural genes. However, the presence of glucose promotes the formation of the CAP-cAMP complex, which binds to a specific site near the promoter region of the lac operon, allowing RNA polymerase to bind and initiate transcription. This is known as positive regulation, as the presence of glucose is required for the efficient expression of the lac operon.
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network of regulatory proteins that govern the orderly progression of a eukaryotic cell through the stages of cell division
The cell cycle control system in a eukaryotic cell is a complex network of regulatory proteins, including cyclins and CDKs, that govern the cell's orderly progression through the stages of cell division.
The network of regulatory proteins that govern the orderly progression of a eukaryotic cell through the stages of cell division is called the cell cycle control system. In eukaryotic cells, this system ensures proper cell division by regulating the cell cycle's key events, including DNA replication, mitosis, and cytokinesis. The cell cycle control system is composed of cyclins, cyclin-dependent kinases (CDKs), and other regulatory proteins.
Cyclins are proteins that fluctuate in concentration throughout the cell cycle, and their levels are crucial for cell cycle progression. Cyclin-dependent kinases are enzymes that become active when bound to cyclins. These CDK-cyclin complexes phosphorylate target proteins, which in turn regulate cell cycle progression.
Key checkpoints within the cell cycle ensure that the cell is ready to progress to the next stage. These checkpoints include the G1 checkpoint, the G2 checkpoint, and the M checkpoint. At these points, regulatory proteins assess the cell's readiness to proceed, and any errors are detected and corrected.
In summary, the cell cycle control system in a eukaryotic cell is a complex network of regulatory proteins, including cyclins and CDKs, that govern the cell's orderly progression through the stages of cell division. This system ensures that cell division occurs accurately and efficiently, maintaining the overall health of the organism.
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Nitrogen from protein is eliminated as what compound in animals? A) ammonia B) urea C) pyrimidine D) both ammonia and urea E) both urea and pyrimidine.
In the given statement, Nitrogen from protein is eliminated as urea compound in animals.
The nitrogen from protein is eliminated in animals mainly as urea, which is a waste product formed in the liver through a series of biochemical reactions that convert ammonia into a less toxic compound. Urea is then transported via the bloodstream to the kidneys, where it is filtered out and eliminated from the body through urine. However, in some animals, such as fish, ammonia is the primary form of nitrogenous waste, and it is excreted directly into the surrounding water. Pyrimidine is not directly involved in the elimination of nitrogen from protein in animals. Therefore, the correct answer is option B) urea. In summary, the elimination of nitrogen from protein in animals involves the conversion of ammonia into urea, which is then eliminated through urine.
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Large flower is dominant to small flower in tulips. if two heterozygous flowers are cross-pollinated what?
If two heterozygous flowers with the dominant trait for large flowers are cross-pollinated, their offspring will have a 3:1 ratio of large flower to small flower traits.
This is because the dominant trait will mask the recessive trait in the heterozygous individuals, resulting in a genotype ratio of 1:2:1 for homozygous dominant, heterozygous, and homozygous recessive genotypes, respectively.
However, all of the offspring will have at least one dominant allele for large flowers due to the dominant trait being present in both parental genotypes.
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Why were the powers of persuasion considered potentially dangerous in democratic Athens?
The ability to affect public opinion and influence the democratic process made the powers of persuasion in democratic Athens potentially perilous. Democracy in ancient Athens was based on the active participation and vote-counting of its populace.
However, when employed dishonestly or for ulterior purposes, the powers of persuasion have the potential to manipulate emotions, mislead the public, and falsify information. This posed a risk to the fairness of democratic decision-making because it might lead to choices that weren't based on logic or the greater good. To protect the democratic ideals of justice, equality, and informed decision-making, the powers of persuasion were so carefully considered.
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Capuchin monkeys live in central and south America. They live in social groups and they are noteworthy for their intelligence, specifically their tool use and social learning. They are omnivores, and feed on a vast range of foods. One seemingly peculiar behavior is leaf rubbing - Capuchin monkeys sometimes rub themselves with leaves from specific plant species.
Use the above observation to answer each of the following sections.
1) Asking a question.Questions can be general, and potentially answered with hypotheses at two or even all four of the levels of analysis. Questions can also be more specific and very clearly intended to be addressed with hypotheses at only a single level. An example of a general question about the above observation that is addressable by hypotheses at all four levels is simply: "Why do capuchin monkeys rub leaves on themselves?" We would like you to write a question that reflects only one of Tinbergen’s four questions and that directly relates to some aspect of the behavioral observation provided above. Let’s start by looking at some example questions. Your first job is to identify which of Tinbergen’s questions (level of analysis) each of these relate to (Proximate Causal/Mechanistic; Proximate Developmental; Ultimate Fitness; Ultimate History).
What benefit do the monkeys get from leaf rubbing?
a) Level of analysis: (answer all of these on the answer sheet provided on last page)
Which other monkey species also do this type of behavior?
a. Capuchin monkeys may rub themselves with leaves to repel insects/parasites, mask their scent, or for self-maintenance.
b. Other primate species such as howler monkeys, spider monkeys, and woolly monkeys also engage in leaf rubbing behavior.
a. Leaf rubbing behavior in Capuchin monkeys has several potential benefits. One possible explanation is that it helps them repel insects or parasites, which may be present in their fur. Certain plants contain chemicals that are known to have insecticidal or anti-parasitic properties, and rubbing these leaves onto their fur may help Capuchin monkeys to protect themselves against these pests. Another potential benefit of leaf rubbing is that it could help to mask the monkeys' scent, making them less detectable to predators or prey.
b. Leaf rubbing behavior is not exclusive to Capuchin monkeys; other primate species also engage in this behavior. For example, some species of howler monkeys, spider monkeys, and woolly monkeys have been observed rubbing themselves with certain plant species. In some cases, the behavior may serve similar purposes to those mentioned for Capuchin monkeys, such as insect or parasite repulsion.
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The correct question is:
Capuchin monkeys live in central and south America. They live in social groups and they are noteworthy for their intelligence, specifically their tool use and social learning. They are omnivores, and feed on a vast range of foods. One seemingly peculiar behavior is leaf rubbing - Capuchin monkeys sometimes rub themselves with leaves from specific plant species.
Use the above observation to answer each of the following sections.
a. What benefit do the monkeys get from leaf rubbing?
b. Which other monkey species also do this type of behavior?
Stock size is commonly estimated by (check all that apply) A. Scientific surveys of fish populations B. Theoretical estimates alone C. Predictions from phytoplankton population size D. Landings by fishers E. Mark-recapture studies F. Counting every fish in the population
Stock size is commonly estimated by:
A. Scientific surveys of fish populations
B. Theoretical estimates alone (less common)
D. Landings by fishers
E. Mark-recapture studies
Stock size, or the abundance of fish in a population, can be estimated by various methods. Some common methods include:
A. Scientific surveys of fish populations: These surveys involve sampling fish populations in a particular area and using statistical methods to estimate the size of the population.
B. Theoretical estimates alone: These estimates are based on mathematical models that incorporate factors such as growth rates, mortality, and reproduction rates
C. Predictions from phytoplankton population size: Phytoplankton are microscopic plants that form the base of many aquatic food webs. Predictions of fish stock size can be made based on the abundance of phytoplankton in the water.
D. Landings by fishers: The amount of fish caught by commercial or recreational fishers can be used to estimate the size of the population, although this method has limitations.
E. Mark-recapture studies: This method involves tagging a sample of fish, releasing them back into the population, and then recapturing some of them later. The proportion of tagged fish in the recapture sample is used to estimate the size of the population.
F. Counting every fish in the population: This method is rarely feasible, especially for large populations or species that live in vast or remote areas. However, it can be used in small-scale research or conservation projects
Therefore, the correct options are A, B, D, and E.
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As compared to SO muscle fibers, all of the following are correct about FG muscle fibers except: a.) They have low mitochondrial density b.) They are innervated by large motor neurons c.) They have lower capillary density d.) They have lower recruitment threshold e.) They have high activity of myosin ATPase.
As compared to SO muscle fibers, all of the following are correct about FG muscle fibers except d) They have a lower recruitment threshold.
As compared to SO muscle fibers, all of the following are correct about FG muscle fibers except d) They have a lower recruitment threshold. Fast Glycolytic (FG) muscle fibers have high myosin ATPase activity, low mitochondrial and capillary density, and are innervated by large motor neurons. These fibers are designed for short, powerful bursts of energy and fatigue more quickly than slower-twitch oxidative fibers. They are used for activities such as weightlifting or sprinting.
However, FG fibers have a higher recruitment threshold, meaning they are not recruited until the activity requires high force output or maximal efforts. Slow-twitch oxidative fibers (SO), on the other hand, have a higher capillary and mitochondrial density, are innervated by smaller motor neurons, and have a lower myosin ATPase activity. They are designed for endurance activities and are fatigue-resistant.
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these bacteria produce a toxin that causes: ___ whoopingcough psoriasiscystic fibrosis
Answer:
Cystic Fibrosis
Explanation:
if the sequence of an rna molecule is 5’-ggcaucgacg-3’, what is the sequence of the template strand of dna? a. 5’-ggcatcgacg-3’ b. 3’-ggcatcgacg-5’ c. 5’-ccgtagctgc-3’ d. 5’-cgtcgatgcc-3’
If the sequence of an rna molecule is 5’-ggcaucgacg-3’, the sequence of the template strand of DNA is b. 3’-ccgatcgctg-5’
The sequence of the template strand of DNA can be determined by using the rules of complementary base pairing. In RNA, adenine pairs with uracil (instead of thymine), cytosine pairs with guanine, and vice versa. Therefore, to find the template strand of DNA, we need to replace uracil with thymine in the RNA sequence and then determine the complementary bases.
The given RNA sequence is 5’-ggcaucgacg-3’. Replacing uracil with thymine, we get 5’-ggcatcgacg-3’, to find the complementary bases, we need to pair adenine with thymine and cytosine with guanine. Therefore, the template strand of DNA is 3’-ccgatcgctg-5’ (option B). In summary, the template strand of DNA for the given RNA sequence 5’-ggcaucgacg-3’ is 3’-ccgatcgctg-5’. This is because the RNA sequence is complementary to the DNA template strand, where adenine pairs with thymine and cytosine pairs with guanine.
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Match the following muscle movements as either an Isometric contraction or an Isotonic contraction. Remember that isotonic contractions ch muscle and isometric contractions do not Hint: Only two of the examples are isometric. Pace your hand underneath the table. Push up on the table while keeping A. Isometric your arm straight Y Lay on your back on the floor. Pull your chest up to your knees (a sit up). Sit in a chair and place a ball between your feet. Slowly lift your feet into the air. - B. Isotonic A Lie on your side on the floor and raise your upper leg towards the ceiling. - VI Sit in a non-moveable chair and place your feet straight out in front of you against a solid object. Try to push away the desk.
A and E are Isometric contractions, while examples B, C, and D are Isotonic contractions.
To match the muscle movements as either Isometric contraction or Isotonic contraction. Here's the classification of each example:
A. Place your hand underneath the table. Push up on the table while keeping your arm straight - Isometric contraction.
B. Lay on your back on the floor. Pull your chest up to your knees (a sit-up) - Isotonic contraction.
C. Sit in a chair and place a ball between your feet. Slowly lift your feet into the air - Isotonic contraction.
D. Lie on your side on the floor and raise your upper leg towards the ceiling - Isotonic contraction.
E. Sit in a non-moveable chair and place your feet straight out in front of you against a solid object. Try to push away the desk - Isometric contraction.
To summarize, examples A and E are Isometric contractions, while examples B, C, and D are Isotonic contractions.
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Kera is investigating how nitrogen runoff from organically fertilized comfields is affecting the local streams and takes. The focus of her study is: Select only ONE answer choice. Energy cycling Population ecology Trophic levels Nutrient cycling
The focus of Kera's study is nutrient cycling. This is because she is investigating how the nitrogen runoff from organic fertilizers used in cornfields is affecting the local streams and lakes.
Nitrogen is an important nutrient for plant growth, but too much of it in water bodies can lead to harmful algal blooms and other negative impacts on aquatic life.
Nutrient cycling is the process by which nutrients like nitrogen are taken up by plants, recycled through the ecosystem, and eventually returned to the soil. When excess nitrogen enters water bodies, it disrupts this natural cycle and can cause ecological imbalances.
Therefore, Kera's research is focused on understanding how organic farming practices may impact nutrient cycling in local ecosystems and help identify potential solutions to reduce nitrogen runoff and protect the health of aquatic environments .
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Regarding the enzyme in Part 2, before the first one terminated. of these would be required if a new round of DNA replication began Which of the following is true of the newly synthesized daughter chromosomes? A. Each chromosome contains one parental and one newly synthesized DNA strand. B. They remain single-stranded until after septation. C. Each strand on each chromosome contains interspersed segments of new and parental DNA. D. They are both double-stranded, but nonidentical, because of crossing over. E. One consists of a double helix of two new DNA strands, whereas the other is entirely parental.
Each chromosome contains one parental and one newly synthesized DNA strand during DNA replication, following the semi-conservative model (option a).
The semi-conservative model of DNA replication, proposed by Watson and Crick, accurately describes the process.
According to this model, during replication, each of the two parental DNA strands serves as a template for synthesizing a new, complementary DNA strand.
As a result, each daughter chromosome contains one parental DNA strand and one newly synthesized strand. This allows the genetic information to be accurately passed on to the next generation.
The other options (B, C, D, and E) do not accurately describe the structure of newly synthesized daughter chromosomes during DNA replication.
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Regarding the debate between Selectionists, (who advocated that natural selection is responsible for most or all of the genetic variation observed in natural populations) and Neutalists (who advocated the Neutral Theory of Molecular Evolution), the evidence supported which viewpoint?
O Neither O viewpoint
O Selectionists
O Neutralists
The evidence overwhelmingly supports the Neutralists' viewpoint in the debate between Selectionists and Neutralists.
The Neutral Theory of Molecular Evolution proposes that the majority of genetic variation in a population is caused by random genetic drift, rather than by natural selection.
This theory is supported by multiple lines of evidence, including the observation that the majority of mutations are neutral or nearly neutral, and that the rate of molecular evolution appears to be largely independent of natural selection.
In contrast, the Selectionist viewpoint proposed that the majority of genetic variation was due to natural selection. However, the lack of evidence supporting this hypothesis, coupled with the abundance of evidence supporting the Neutral Theory, has led to the widespread acceptance of the Neutral Theory in the scientific community.
Overall, the evidence strongly supports the Neutralist viewpoint in the debate between Selectionists and Neutralists, and the Neutral Theory of Molecular Evolution has become a cornerstone of modern evolutionary biology.
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identify how nad nad is used by animal cells during anaerobic respiration.
During anaerobic respiration, animal cells use NAD+ and NADH in glycolysis to generate energy in the absence of oxygen.
NAD+ (nicotinamide adenine dinucleotide) and NADH (reduced form of NAD+) are important coenzymes involved in cellular respiration. During anaerobic respiration, which occurs in the absence of oxygen, animal cells rely on glycolysis to generate energy. Glycolysis is the process of breaking down glucose into pyruvate, which produces a small amount of ATP (adenosine triphosphate). NAD+ is involved in the initial step of glycolysis, where it accepts electrons from glucose and is converted to NADH.
The role of NADH is to carry the electrons to the electron transport chain, which is the process that produces ATP. However, in the absence of oxygen, the electron transport chain cannot function, and NADH accumulates in the cell. This is where NAD+ comes in. NAD+ is needed to keep the glycolytic pathway going by accepting electrons from NADH and converting it back to NAD+. This allows glycolysis to continue, producing a small amount of ATP, which is crucial for cells to maintain their basic functions.
In summary, during anaerobic respiration, animal cells use NAD+ and NADH in glycolysis to generate energy in the absence of oxygen. NAD+ is involved in the initial step of glycolysis, accepting electrons from glucose, while NADH carries the electrons to the electron transport chain to produce ATP. However, in the absence of oxygen, NAD+ is needed to keep glycolysis going by accepting electrons from NADH and converting it back to NAD+. This allows animal cells to maintain their basic functions even in the absence of oxygen.
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which 2 sugars from the pentose phosphate pathway can be used in glycolysis (not including the starting point, glucose 6-phosphate)
The two sugars from the pentose phosphate pathway that can be used in glycolysis are glyceraldehyde 3-phosphate and fructose 6-phosphate.
Glyceraldehyde 3-phosphate is an intermediate of glycolysis that can be converted into pyruvate, which enters the citric acid cycle to produce ATP. Fructose 6-phosphate can be converted into glucose 6-phosphate, which can then enter glycolysis as the starting point. The pentose phosphate pathway generates these sugars by converting glucose 6-phosphate into ribose 5-phosphate, which can then be converted into glyceraldehyde 3-phosphate and fructose 6-phosphate. These sugars are important for energy production and biosynthesis in the cell.
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help pleaseeeeeee!!!!p
The correct option from the given image is B) Are homozygous dominant
Homozygous dominant alludes to a hereditary condition where a person has two duplicates of the same overwhelming allele for a specific quality. This implies that both duplicates of the quality, one acquired from each parent, are the same and code for the prevailing characteristic.
For case, in the event that the overwhelming allele for a quality code for brown eyes, an individual who is homozygous prevailing for that quality would have two duplicates of the brown-eye allele and would have brown eyes.
This condition is additionally signified by two capitalized letters speaking to the overwhelming allele, such as "BB" for brown eyes.
Homozygous overwhelming people will continuously express the overwhelming characteristic, as both duplicates of the gene are prevailing and there's no passive allele display to cover the expression of the prevailing allele.
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2 A scientist is studying how two species of sparrows interact on an island. This is a study at what level of ecology?
A. population
B. community
C. world
D. genetics
The study of how two species of sparrows interact on an island would be considered a study at the level of community ecology. The correct answer is B.
Community ecology focuses on the interactions among different species within a given area or habitat.
It examines how different species coexist, compete, and interact with each other, as well as how these interactions shape the structure and dynamics of the community as a whole.
In this case, the scientist is specifically interested in understanding the interactions between the two species of sparrows on the island.
Population ecology, on the other hand, focuses on the study of individual species and their populations, including factors such as population size, density, distribution, and demographics.
While the study of the sparrows' interactions involves populations of the two species, it goes beyond the scope of studying just one species and delves into the interactions between them, thus placing it at the level of community ecology.
Therefore, the correct answer is B. community.
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