The enzyme amylase accelerates the reaction of changing a. polysaccharides into monosaccharides.b. disaccharides into monosaccharides. c. starch into disaccharides. d. disaccharides into glucose.
The enzyme amylase accelerates the reaction of changing starch into disaccharides. Therefore, the correct option is option C.
An enzyme is a kind of protein that speeds up chemical reactions by decreasing the amount of energy required for them to occur. A biochemical catalyst is an enzyme.
Every enzyme is highly specialized in terms of what reaction it catalyzes (accelerates) and which molecule it interacts with (called its substrate).
It is one of the most abundant and essential digestive enzymes found in the human body. Amylase breaks down complex carbohydrates into simple sugars, such as glucose, maltose, and fructose, that the body can absorb and use for energy.
After that, amylase is produced in the pancreas and secreted into the small intestine, where it breaks down any remaining starch or glycogen in the digestive system. Therefore the correct option is option C.
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In rabbits, genes for Black color and straight ears are dominant over white color and floppy ears. Suppose a rabbit heterozygous for both traits is crossed with a heterozygous black rabbit that has floppy ears. Show the parent genotypes, Punnett square, and phenotype ratio
Consider breeding a black rabbit with floppy ears and a rabbit that is heterozygous for both features. Display 50% gametes with "B" and 50% gametes with "b" to represent the parent genotypes, Punnett square, and phenotypic ratio.
In comparison to white colour and floppy ears, black colour and straight ear genes are more prevalent in rabbits. According to the law of dominance, a heterozygous person has two contrasting factors of a gene, whereas a homozygous person has two copies of the identical factors.
As a result, the homozygous recessive genotype of the rabbit will be bb, and the heterozygous genotype will be Bb. As a result, the heterozygous person creates gametes of two different types: 50% gametes with "B" and 50% gametes with "b".
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the products of protein and carbohydrate digestion are absorbed into the __________; while the products of lipid digestion are absorbed into the _________.
The products of protein and carbohydrate digestion are absorbed into the duodenum or proximal jejunum of the small intestine.
while, the products of lipid digestion takes place in the small intestine.
they are digested also with the help of pancreas and enzymes the lipids are digested as they are water insoluble.
small intestine is the location where the gastrointestinal tract between the stomach and the large intestine, and is where most of the end absorption of food takes place.
parts of small intestine is,
Duodenum, Jejunum, Ileum
The other function of small intestine is, to breakdown food, absorb the nutrients, extracts water and also move food along the gastrointestinal tract.
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what characteristics or adaptations did the extinct organisms lack to not be able to survive during the triasic jurrasic
The characteristics or adaptations the extinct organisms lack to not be able to survive during the triassic jurrasic period is adaptation for burrowing, specialized teeth, and dehydration resistance.
What are the adaptations?During the Triassic-Jurassic, extinct organisms lacked certain characteristics or adaptations that prevented them from surviving. The following are some examples of such characteristics or adaptations: Adaptations for Burrowing: Many Triassic species had evolved adaptations for burrowing that allowed them to escape harsh environments or predators. However, such adaptations did not help them survive the Jurassic era's drier and hotter conditions.
Specialized Teeth: Various Triassic species had specialized teeth to eat tough plants, which were abundant during that era. But, after the Permian extinction, new plant types emerged, and these specialized teeth did not allow these species to survive. Dehydration Resistance: Many Triassic species could withstand dehydration, which was a necessary adaptation in arid conditions. However, the Jurassic era had much drier and hotter conditions, which meant that the species could not withstand the new environmental conditions.
In summary, the lack of suitable adaptations for the new environmental conditions, particularly the drier and hotter conditions, was one of the main reasons why certain extinct organisms could not survive during the Triassic-Jurassic era.
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when someone is standing, gravity stretches the bottom of the lung down toward the floor to a greater extent than the top of the lung. what implication could this have on the flow of air in the lungs? where does gas exchange occur in the lungs?
Standing affects the pressure gradients in the lungs, leading to increased airflow and gas exchange at the bottom of the lungs. Gas exchange occurs in the alveoli, which are tiny sacs at the very end of the bronchioles.
When someone is standing, gravity stretches the bottom of the lung down toward the floor to a greater extent than the top of the lung. This has the implication of limiting the amount of air that flows to the lower regions of the lung since the force of gravity is stronger at the bottom of the lung than at the top. This means that air is more likely to accumulate in the top part of the lung than at the bottom.
Gas exchange takes place in the alveoli, which are small air sacs found in the lungs. When air enters the lungs, it flows into the bronchioles, which divide into smaller tubes called alveolar ducts. These ducts end in tiny air sacs called alveoli, where gas exchange occurs. Oxygen from the air diffuses across the walls of the alveoli and into the bloodstream, while carbon dioxide diffuses out of the bloodstream and into the alveoli, to be expelled during exhalation.
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Cofactors for the Citric Acid Cycle Suppose you have prepared a mitochondrial extract that contains all the soluble enzymes of the matrix but has lost (by dialysis) all the low molecular weight cofactors. What must you add to the extract so that the preparation will oxidize acetyl-CoA to CO2?
Cofactors for the Citric Acid Cycle- In order for the preparation to oxidize acetyl-CoA to CO2, you must add the low molecular weight cofactors to the mitochondrial extract that contains all the soluble enzymes of the matrix but has lost (by dialysis) all the low molecular weight cofactors.
The citric acid cycle is also referred to as the Krebs cycle or the tricarboxylic acid cycle. It is a metabolic pathway that completes the oxidation of carbohydrates and fats through the production of carbon dioxide and energy.
Cofactors: They are usually metal ions, coenzymes, or organic molecules. They are essential in ensuring that enzymes work efficiently. An enzyme can only work effectively if it is associated with the correct cofactor or coenzyme. Examples of cofactors include heme, biotin, and NAD+.
Citric acid: Citric acid is a weak organic acid with the molecular formula C6H8O7. It is found naturally in citrus fruits such as lemons and oranges. Citric acid is used in a variety of industries, including food, beverage, and pharmaceuticals. The citric acid cycle is a vital process in which the body breaks down carbohydrates, fats, and proteins into usable energy. It occurs in the mitochondria of eukaryotic cells.
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how many types of mrna are transcribed from the lac operon?
There are three different types of mRNA transcribed from the lac operon. The lac operon is an operon in E. coli that contains genes for the metabolism of lactose.
The three genes in the lac operon are lacZ, lacY, and lacA, which are responsible for producing the proteins beta-galactosidase, lactose permease, and thiogalactoside transacetylase, respectively. The transcription of these genes is regulated by the presence or absence of lactose and glucose in the cell's environment. When lactose is present, it binds to the repressor protein, causing it to change shape and release from the operator region of the DNA. This allows RNA polymerase to bind to the promoter region and initiate transcription of the lac operon. The mRNA transcribed from the lac operon can be divided into three types based on the genes that they contain. The primary transcript is polycistronic, meaning that it contains all three genes in the lac operon. However, the primary transcript is quickly processed into three separate mRNA molecules, each of which contains only one of the three genes. This allows for the regulation of each gene's expression independently.
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Light ray A moves from air to water. Part of ray A is reflected at the air-water boundary. Which arrow in the image is the reflected ray? A picture shows a light ray A moving from air to water. Ray B moves from water to air. The rays C and D move down inside the water and the ray E moves along the surface of the water. A. B B. C C. D D. E
An elementary reaction is known to be bimolecular. What does this mean? A) Two molecules of products are made B) The order of the reaction is 2 C) Two molecules must collide at the same time D) Both A and B E) Both B and C
An elementary reaction is known to be bimolecular. This means that two molecules must collide at the same time. Thus, option C is the correct answer.
Bimolecular reactions are chemical reactions that occur between two reactant molecules. According to reaction kinetics, bimolecular reaction rate laws have second-order kinetics. The reaction rate is proportional to the product of the concentrations of two reactants, so the concentration of two reactants in the collision is necessary. Thus, the reaction is bimolecular. The general formula of the reaction is A + B -> AB. The rate equation of the bimolecular reaction is rate = k [A] [B] or rate = k [A]^2.The order of a reaction is determined by the order of the slowest elementary step. The order of the reaction is 2 when a bimolecular reaction occurs through an elementary step. Thus, option B is incorrect. An elementary reaction only includes a single step. The species present in the reactants and products of an elementary reaction are known as molecules, ions, or atoms. In an elementary reaction, the number of products that form corresponds exactly to the number of reactants that are lost. Thus, option A is also incorrect. Therefore, the correct option is C) Two molecules must collide at the same time.
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what is the source of the majority of the energy needed by muscles for physical activity that continues for longer than 30 or 40 minutes? aerobic respiration of pyruvic acid in mitochondria atp produced from creatine phosphate stored in muscle fibers glycolysis of glucose in the cell cytoplasm atp stored in muscle fibers
The majority of the energy needed by muscles for physical activity that continues for longer than 30 or 40 minutes is obtained from aerobic respiration of pyruvic acid in mitochondria.
What is aerobic respiration?Aerobic respiration is a process by which cells turn glucose, oxygen, and other molecules into energy, water, and carbon dioxide. This process occurs in the mitochondria of cells. Aerobic respiration can produce 36 to 38 ATP molecules from each molecule of glucose it metabolizes. This process is one of the two ways the body generates energy, with anaerobic respiration being the other.
Glycolysis is the breakdown of glucose to produce ATP, and it occurs in the cytoplasm of cells. This process produces two ATP molecules from each molecule of glucose that is metabolized. The ATP produced by glycolysis is utilized quickly and cannot sustain prolonged physical activity.
ATP stored in muscle fibers, on the other hand, is a temporary energy source that can provide energy for only a few seconds of muscle activity.
ATP produced from creatine phosphate stored in muscle fibers can supply energy for a short burst of intense activity. It can supply energy for activities like weightlifting or sprinting but cannot provide energy for activities lasting longer than a few seconds.
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Which evidence suggests that some of the first life on earth was prokaryotic bacteria?
a catabolic pathway that breaks down organic molecules and uses an electron transport chain for the production of atp is called ____
The catabolic pathway that breaks down organic molecules and uses an electron transport chain for the production of ATP is called Cellular respiration.
Cellular respiration is a process by which energy is obtained by breaking down organic compounds such as carbohydrates and fats. This energy is stored in the form of ATP (Adenosine triphosphate), which is used by the cell to perform various functions.There are three main stages involved in cellular respiration:Glycolysis: This is the first stage of cellular respiration, and it occurs in the cytoplasm of the cell. In this stage, glucose is broken down into pyruvate, and a small amount of ATP is produced. Krebs cycle: This stage occurs in the mitochondria of the cell, and it involves the conversion of pyruvate into acetyl-CoA. During this stage, more ATP is produced, along with CO2 and H2O. Electron transport chain: This is the final stage of cellular respiration, and it occurs in the inner membrane of the mitochondria. During this stage, electrons are transported through a series of proteins, and ATP is produced as a result.So, the catabolic pathway that breaks down organic molecules and uses an electron transport chain for the production of ATP is called Cellular respiration.Learn more about the electron transport chain: https://brainly.com/question/18686654
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The land plants are probably descendants of which of these groups? a. green algae b. red algae c. brown algae d. angiosperms. a. green algae.
The land plants are probably descendants of green algae. Therefore the correct option is option A.
Green algae are considered the likely ancestors of land plants since they share a common ancestor and possess some comparable characteristics. Green algae are tiny freshwater or marine unicellular or multicellular algae that grow in colonies, and they resemble plants because they have cell walls composed of cellulose and chlorophyll a and b pigments in their chloroplasts.
Green algae have flagellated sperm and alternation of generations, which are traits that are also present in land plants, according to scientists. Hence, the correct option is (a) green algae.
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Which of the lymphatic organs is also part of the skeletal system?
A. spleen
B. thymus
C. tonsils
D. red marrow
E. lymph nodes
D. Red marrow, Red marrow is also part of the skeletal system
What is the lymphatic organ?The lymphatic organ is the spleen. The spleen is an organ located in the upper left side of the abdomen, behind the stomach. It is part of the lymphatic system, which helps to filter and remove toxins, bacteria, and other foreign substances from the body.
The lymphatic system also includes lymph nodes, lymph vessels, and the thymus. Lymph nodes are small, bean-shaped organs located throughout the body that filter and trap bacteria, viruses, and other foreign substances from the lymph fluid. The lymph vessels are a network of tubes that transport lymph fluid and other substances throughout the body. The thymus is a small organ located behind the sternum (breastbone) that helps regulate the body's immune system.
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identify the region of the temporal bone that articulates with the lower jaw.
The region of the temporal bone that articulates with the lower jaw is called the mandibular fossa.
It is a concave depression located on the undersurface of the temporal bone, in the area known as the squamous part of the bone. The mandibular fossa is located just in front of the external acoustic meatus, which is the opening of the ear canal.
The mandibular fossa is an important part of the temporomandibular joint (TMJ), which connects the jawbone (mandible) to the skull. Specifically, the rounded surface at the top of the mandible, called the mandibular condyle, fits into the mandibular fossa to form the TMJ. This joint allows for the movement of the jaw during chewing, speaking, and other oral functions.
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in the earthworm body plan, the digestive system can be described as a tube-within-a-tube. where would you expect to find most of the tissues that developed from endoderm?
In the earthworm body plan, the digestive system is indeed a tube-within-a-tube, which means that there are two concentric tubes or layers within the body.
The digestive tract, which extends from the mouth to the anus, is the digestive system's inner tube, and the body wall is its outer tube.
The endoderm is one of the three basic germ layers that give rise to the numerous bodily tissues and organs during embryonic development. The digestive tract's lining and its accompanying organs, including the liver, pancreas, and respiratory system, are produced by the endoderm. Hence, we would anticipate that the digestive system, which is the inner tube of the earthworm body plan, would include the majority of the tissues that evolved from endoderm. Particularly, the endoderm is the source of the lining of the earthworm's digestive tract, which includes the pharynx, esophagus, crop, gizzard, intestine, and anus.
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Baby Jessica's parents respond to her every need as soon as she cries. Freud would predict that, as an adult, Jessica will ________.a. become sexually promiscuousb. be well adjustedc. be passived. rebel against authority figures
Baby Jessica's parents respond to her every need as soon as she cries. Freud would predict that, as an adult, Jessica will be passive.The correct answer is c.
According to Freud's psychoanalytic theory, a child's first relationships are with its mother, and it is in these relationships that the ego emerges. The id, ego, and superego are the three components of the mind (conscious and unconscious) that have an impact on behavior.
The id is the instinctual side of the psyche that is driven by the need for immediate gratification, while the ego is the logical side of the psyche that helps to mediate the conflict between the id and the superego.The parents of Baby Jessica's are providing her with immediate gratification by responding to her every need as soon as she cries.
Freud would predict that Jessica would be passive as an adult because she would not be learning how to delay gratification, which is a critical skill for developing a healthy ego. Delaying gratification involves recognizing that immediate gratification may not be the best course of action in the long term.
In conclusion, Baby Jessica's parents respond to her every need as soon as she cries. Freud would predict that Jessica would be passive as an adult because she would not be learning how to delay gratification, which is a critical skill for developing a healthy ego.
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Which hormones regulate the amount of water and salt reabsorbed by the DCT and collecting duct? select all that apply.a) angiotensin converting enzymeb) antidiuretic hormonec) epinephrined) aldosteronee) natriuretic peptides
The hormones that regulate the amount of water and salt reabsorbed by the DCT (distal convoluted tubule) and collecting duct are:
b) Antidiuretic hormone (ADH), also known as vasopressin, regulates the water reabsorption in the collecting duct by increasing the permeability of the cells lining the duct. This hormone is released by the posterior pituitary gland in response to changes in blood osmolarity.
d) Aldosterone, a steroid hormone secreted by the adrenal cortex, regulates the reabsorption of sodium ions and the secretion of potassium ions in the DCT and collecting duct. This hormone increases the expression of sodium channels and sodium-potassium ATPase pumps in the cells lining the tubules, leading to increased reabsorption of sodium and water.
e) Natriuretic peptides, such as atrial natriuretic peptide (ANP) and brain natriuretic peptide (BNP), are hormones released by the heart in response to increased blood volume and pressure. These hormones increase the excretion of sodium and water by inhibiting the secretion of ADH and aldosterone, leading to increased urine output.
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if photosynthesis and respiration are almost symmetrical processes, how is energy lost in the process of converting sugar back into atp?
Photosynthesis and respiration are almost symmetrical processes, as both involve the conversion of energy between different forms. During photosynthesis, light energy is converted into chemical energy in the form of glucose, while during respiration, glucose is broken down to release energy that is used to produce ATP.
However, while the overall process of converting sugar back into ATP is exergonic (releases energy), there is still some energy lost in the form of heat. This is because not all of the energy released during the breakdown of glucose can be captured and converted into ATP.
Some of the energy is lost during the conversion process itself, as well as through various metabolic reactions that occur throughout the cell. Therefore, while photosynthesis and respiration are symmetrical in terms of the overall conversion of energy, there is still some energy loss during the process of converting sugar back into ATP.
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Which best represents the overall equation for photosynthesis?
1. 6 CO2 + 12 H2O + Light energy → C6H12O6 + 6 O2
2. 6 CO2 + 6 H2O + Light energy → C6H12O6 + 6 O2
3. 6 CO2 + Light energy → C6H12O6 + 6 O2 + 6 H2O
4. C6H12O6 + 6 O2 + 6 H2O + Light energy → 6 CO2 + 12 H2O
The overall equation for photosynthesis is:
6 CO2 + 6 H2O + Light energy → C6H12O6 + 6 O2
This equation represents the process by which green plants, algae, and some bacteria convert carbon dioxide (CO2) and water (H2O) into glucose (C6H12O6) and oxygen (O2) in the presence of sunlight.
The equation can be broken down into two main stages: the light-dependent reactions and the light-independent reactions (also known as the Calvin cycle). During the light-dependent reactions, light energy is absorbed by chlorophyll and other pigments in the thylakoid membranes of the chloroplasts, leading to the generation of ATP and NADPH, which are used in the next stage. During the light-independent reactions, also known as the Calvin cycle, carbon dioxide is fixed into glucose using ATP and NADPH generated during the light-dependent reactions.
The overall equation for photosynthesis is important because it summarizes the net result of the process, which is the conversion of carbon dioxide and water into glucose and oxygen. This equation serves as a fundamental concept in biology and is critical to our understanding of how plants and other organisms produce energy and oxygen.
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Mr. Freidhoff’s Mendelian Genetics’ Packet 2022-2023 Mendelian Genetics: Alleles and Genotypes
Alleles are versions of a gene that can have different effects on the trait or characteristics of an organism.
What is organism?Organism is a living thing that has a biological structure and can reproduce itself. It can be a single celled microbe like bacteria, or a complex multicellular life form like humans.
There are two forms of alleles, Dominant and Recessive. Dominant alleles are expressed in the organism, while Recessive alleles are not expressed.
Genotypes are the genetic makeup of an organism. This includes all of the alleles that make up the organism. It is important to understand how alleles and genotypes work together in order to understand how traits are passed on from one generation to the next.
To explain further, let’s look at an example. Let’s say that we have two alleles that control a trait, A and a. A is the dominant allele and a is the recessive allele.
If a person has two dominant alleles, AA, they will have the trait that is determined by the A allele. This is known as a homozygous dominant genotype. If a person has one dominant allele and one recessive allele, Aa, they will also have the trait that is determined by the A allele. This is known as a heterozygous genotype.
In this example, if two people with the Aa genotype have a child, the child has a 50% chance of inheriting the A allele from each parent, and a 50% chance of inheriting the a allele from each parent. This is known as Mendel’s law of segregation.
By understanding how alleles and genotypes work together, we can better understand how traits are passed on from one generation to the next. We can also gain insight into how certain traits are inherited and how they can be changed over time.
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Mendelian genetics is the study of how traits are passed from parents to offspring according to the laws of inheritance first described by Gregor Mendel in the 19th century.
What is Offspring?
Offspring refers to the children or descendants of an organism. In the context of biology and reproduction, offspring can refer to the offspring produced by a single organism, or to the collective offspring of a group of organisms.
An allele is a variant form of a gene that determines a particular trait. Each individual has two alleles for each gene, one inherited from each parent. The combination of alleles an individual has is called their genotype.
The genotype can be homozygous or heterozygous. Homozygous means an individual has two identical alleles for a particular gene (e.g. AA or aa). Heterozygous means an individual has two different alleles for a particular gene (e.g. Aa).
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true or false with genetic testing, it is possible to predict with nearly 100% accuracy who will get the disease.
The statement " it is possible to predict with nearly 100% accuracy who will get the disease" on genetic testing is false.
What is genetic testing?Genetic testing is a type of medical test that analyzes a person's DNA to look for changes or variations in their genes that may be associated with an increased risk of developing certain medical conditions or inherited disorders.
While genetic testing can provide information about a person's risk of developing certain diseases, it is not possible to predict with nearly 100% accuracy who will get the disease. This is because there are many factors that contribute to the development of a disease, including environmental factors and lifestyle choices, in addition to genetic factors.
Therefore, even if someone has a genetic predisposition to a disease, it does not guarantee that they will develop the disease. Additionally, genetic testing is not always 100% accurate and can sometimes produce false positives or false negatives.
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which organelle contains hydrolytic enzymes used to break down polymers?
o centriole
o lysosome
o chromoplast
o chloroplast
The organelle that contains hydrolytic enzymes used to break down polymers is the lysosome.
Lysosomes are membrane-bound organelles found in eukaryotic cells that contain hydrolytic enzymes, including proteases, lipases, and nucleases. These enzymes are involved in breaking down different types of molecules, such as proteins, lipids, and nucleic acids, into their smaller subunits.
The lysosome acts as the "recycling center" of the cell, breaking down and digesting unwanted materials or organelles. They also play a critical role in cellular defense by degrading foreign invaders, such as bacteria or viruses, that have been engulfed by the cell.
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which scientist found that all plants are made of cellsMatthais Schleiden William Harvey. Jean-Baptiste Lamarck.Charles Darwin
The scientist who discovered that all plants are made of cells was Matthias Schleiden. Here option A is the correct answer.
Schleiden was a German botanist who, along with Theodor Schwann, is credited with developing the cell theory. In 1838, Schleiden observed plant tissues under a microscope and noted that they were composed of discrete units that he called "cells."
He also observed that the cell was the basic unit of structure and function in plants and that all plant tissues, including stems, leaves, and roots, were composed of cells. Schleiden's discovery that all plants were composed of cells was a major breakthrough in the field of biology and laid the foundation for cell theory.
The cell theory states that all living organisms are composed of one or more cells and that the cell is the basic unit of life. This theory was later expanded upon by Theodor Schwann, who observed that animal tissues were also composed of cells. Together, Schleiden and Schwann's work helped to establish the fundamental principles of modern biology.
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Complete question:
which scientists found that all plants are made of cells
A - Matthais Schleiden
B - William Harvey.
C - Jean-Baptiste Lamarck.
D - Charles Darwin
A concise diagram of a fruit
The exocarp, mesocarp, and endocarp are normally the three major components of a fruit.
Exocarp: Often referred to as the fruit's skin, this is the fruit's outermost covering.
The central, fle shy layer of the fruit known as the mesocarp is where the majority of the fruit's mass is located.
The endocarp, or innermost layer of the fruit, encloses the seeds.
FruitA flower's developed ovary that bears seeds is referred to as a fruit. Usually, an ovary develops into a fruit and the ovules inside mature into seeds after pollination and fertilization of the flower. The fruit is then propagated via a variety of techniques, including wind, water, or animals, which aid in dispersing the seeds and ensuring the survival of the plant species.The exocarp, mesocarp, and endocarp are the fruit's three primary structural components. The fruit's exocarp, commonly referred to as the skin, is its outermost covering. It serves to guard the fruit against harm, water loss, and pests and is frequently thin and colorful. Depending on the fruit, the exocarp may be smooth, ha iry, waxy, or textured.learn more about fruit here
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why is nikolaas tinbergen considered one of the founders of ethology?
Nikolaas Tinbergen is considered one of the founders of ethology because he provided important and influential contributions to the development of the field of ethology.
Tinbergen's research was based on animal behavior, specifically, how the behavior of animals evolves and functions within their environment.
Ethology is a branch of biology concerned with the scientific study of animal behavior, which includes both innate and learned behavior.
Ethology also explores the behavioral relationships between animals of the same species, between animals of different species, and between animals and their environment.
Nikolaas Tinbergen's contributions to ethology Nikolaas Tinbergen provided several contributions to ethology, including his work on fixed action patterns, supernormal stimuli, and the concepts of sign stimulus and releaser.
Overall, Tinbergen's work and contributions have been important for the development of ethology as a scientific discipline.
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12. The green revolution
depended on
a. new biodegradable
pesticides.
b. high-yielding grain
varieties.
c. clearing forest for crop
land.
d. organic fertilizers.
Answer: b. high-yielding grain varieties.
what happens during the process of paracrine signaling?
Paracrine signaling is a type of cell-to-cell communication in which a cell secretes a signal molecule, called a paracrine factor, into the extracellular environment, which then diffuses to nearby target cells.
The process of paracrine signaling begins with the production of the signal molecule by the signaling cell where the signal molecules then diffuse through the extracellular environment and are detected by receptors on the surface of nearby target cells. Upon recognition of the signal molecule, these receptors activate intracellular pathways which alter the activity of the target cell, resulting in a physiological response. Paracrine signaling is an important mechanism for controlling cell behavior in many different types of tissues and organs. It can be used to coordinate the activity of cells in a particular tissue or to control the development of a particular organ.
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What structure is an extension of the spine of the scapula? a. acromion b. coracoid process c. supraglenoid tubercle d. glenoid cavity.
The structure that is an extension of the spine of the scapula is acromion. Therefore the correct option is option A.
The acromion is a bony prominence on the scapula bone. It is an extension of the scapular spine and appears as a flat, curved bone on the top of the shoulder. The acromion is situated at the posterior-lateral part of the scapula and is the uppermost bony projection of the shoulder blade.
It connects the scapula to the clavicle bone and contributes to the formation of the acromioclavicular joint. The primary function of the acromion is to protect the underlying shoulder joint and the rotator cuff tendons from any external harm or injury.
It also provides an attachment site for the deltoid muscle that covers the shoulder joint and helps in moving the upper limb. The acromion has different shapes and sizes, and its morphology can vary between different individuals. Therefore the correct option is option A.
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which of these is most likely to increase in garter snakesA. The avarge number of genes in the garter snake populationB. the number of time garter snake replicates the variant geneC. The frequency of the variant gene in the garter snake populationD. The avarage number of time genes mutate to create tolerance for the toxin
The most likely factor to increase in garter snakes is the frequency of the variant gene in the population. Here option C is the correct answer.
Garter snakes are known to be highly adaptable and can evolve rapidly to tolerate or resist toxins from their prey. This adaptation is usually driven by natural selection, which favors individuals with traits that provide a survival advantage in their environment.
If a variant gene that provides toxin resistance arises in a garter snake population, and this trait confers a survival advantage in their environment, then the frequency of this gene will increase over time through natural selection. The garter snakes that possess the variant gene will be better adapted to their environment and more likely to survive and reproduce, passing on the variant gene to their offspring.
Therefore, the frequency of the variant gene is the most important factor in determining the evolution of toxin resistance in garter snakes. The other factors listed, such as the number of genes in the population or the rate of gene replication or mutation, may also play a role in evolution, but their effect on adaptation to toxins is likely to be indirect.
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