Answer:
hox genes are a subset of regulatory genes that encode transcription factors and they are important for embryonic development. they are activated by a cascade of regulatory genes and the proteins encoded by the early genes regulate expressions of later genes
Explanation:
The orderly arrangement and clear boundary lines of expression for each Hox gene suggest that many Hox genes are regulatory genes. Hox genes produce transcription factors that control the expression of other genes, regulating the developmental processes that determine segment placement and body plan.
Describe more about Hox genes ?The placement of Hox genes in a particular order along the chromosome is also indicative of their regulatory function. Hox genes are clustered together and in the same order as the body axis of the organism, suggesting that their arrangement is not random but rather a functional design.
Additionally, the ability to induce Hox gene expression in the wrong part of the body and cause the development of body parts from a different region of the organism further supports the regulatory role of Hox genes.
This shows that Hox genes have the ability to control the fate of cells and determine the formation of body structures. Therefore, it is clear that many Hox genes are regulatory genes that play a critical role in controlling the complex developmental processes of organisms.
Hox genes are also known for their role in evolutionary biology. Changes in the expression pattern or function of Hox genes can result in significant changes in body plan and morphology, leading to the development of new structures and functions.
For example, it is believed that the evolution of the arthropod body plan and the development of the jointed appendages in insects was due to changes in the expression of Hox genes. Similarly, changes in the Hox gene expression pattern have also been linked to the evolution of the vertebrate body plan and the development of the vertebrate limb.
Moreover, Hox genes have been linked to several human genetic disorders. Mutations in Hox genes can cause developmental abnormalities such as synpolydactyly, a condition where fingers and toes are fused together, or polydactyly, where there are extra fingers or toes. Mutations in Hox genes have also been associated with some forms of cancer, such as leukemia.
In summary, Hox genes are a family of regulatory genes that play a critical role in controlling the complex developmental processes of organisms. They are known for their role in determining segment placement and body plan and have been linked to evolutionary changes, developmental abnormalities, and some forms of cancer.
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What would be the name for a disturbance that harms some organisms, but does not
hurt the ecosystem?
A. Primary disturbance
B. Small disturbance
C. Secondary disturbance
D. Cyclical disturbance
Answer:
B. small disturbance (a p e x)
Answer:
B. Small disturbance
Explanation:
I'm just trying to make this question easier to find than the other ones that have incorrect answers. Alright, hope this helps someone! Have a nice day :)
What three things are needed for a plant to
carry out photosynthesis?
Glucose, Oxygen, Sunlight
CO2, Oxygen, Sunlight
CO2, Water, Sunlight
Oxygen, Water, Sunlight
What might happen at the cellular level of the plant if there was no water available for photosynthesis?
Answer:
when water levels are low due to water stress, photosynthesis can slow or even stop, causing internal food supplies vital to other processes to diminish or disappear -- yellowing may also occur if photosynthesis stops completely.
Explanation:
If there was no water available for photosynthesis, the cellular level of the
plant will be affected negatively in areas such as shrinking of cells and
decrease in photosynthetic activities.
Plants require water to produce food in the process known as
photosynthesis. When there is no water the photosynthesis is slowed down
and the cells begin to shrink.
The shrinking of cells then results to the wilting and yellowing of leaves of the plant.
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When iron in the rock or steel rusts, it’s taking some of the iron and turning it into iron oxide. Bill Nye says it’s ____________________ erosion.
is oxidation reaction
Rusting is an oxidation reaction. The iron reacts with water and oxygen to form hydrated iron(III) oxide, which we see as rust.
Explanation:
Purines are made up of a ___ ring
Answer:
double rings(two)
Explanation:
The purines(adenine and guanine) have a two-ringed structure consisting of a nine-member molecule with four nitrogen atoms.
2. Explain how similar and different sexual reproduction in plants and animals is?
Answer:Both plants and animals reproduce sexually, producing a male and female gamete, which fuse to form a zygote. However, plants are also able to reproduce asexually, unlike most animals. ... In sexual reproduction in animals, the two gametes are the spermatozoa and the oocyte, which when fused become the ovum.
Explanation:
A pathogenic RNA molecule is called a...
capsid
Virion
Virold
prion
PLEASE HELP(this question has been asked a lot of times by other people with no good answers.)
1. Which of the following statements about classification of organisms is true?
A: Phylogenetic classification uses genetics and ancestral relationships to classify organisms.
B: The Linnaean system of classification takes into account ancestral relationships between organisms
C: Linnaeus concentrated on the genetic characteristics of organisms to classify them.
D:In phylogenetic classification, the group that organisms are put into is called a taxon.
Answer:
Phylogenetic classification uses genetics and ancestral relationships to classify organisms.
Explanation:
took the test
The correct option is (a) Phylogenetic classification uses genetics and ancestral relationships to classify organisms.
Phylogeny classifies species based on evolutionary kinship or evolutionary distance (taxonomy). The degree and type of evolutionary distance between organisms determines their phylogenetic connection. Let's define taxonomy in order to better comprehend this idea.The connection between classification and phylogeny?The study and comparison of traits as well as the comparison of groups of organisms are the foundations of both phylogeny and categorization. However, there is a distinct feedback between character interpretation and inferred phylogeny, which is seen in the weighting of the characters used to construct the classification.
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4. Why does semen contain fructose?
A. Fructose breaks down to provide energy for the penis.
B. Fructose travels with the sperm to feed the egg before it is fertilized.
C. Fructose feeds sperm, enabling them to survive long enough to fertilize an egg.
D. Fructose provides energy for the development of the fertilized egg.
I’ll give brainiest:)
Answer:
The answer is C
Explanation:
I just got it right on the quiz
Fructose feeds sperm, enabling them to survive long enough to fertilize an egg.
Semen contains fructose because it feeds the sperm, enabling them to survive long enough to fertilize an egg. Therefore, the correct answer is option C.
What is fructose?Fructose is a type of sugar that provides energy to the sperm as they travel through the female reproductive tract in search of an egg to fertilize. Sperm have a limited lifespan outside the male body, so it is essential that they are supplied with enough energy to reach and fertilize an egg before they die.
The fructose in semen provides this energy to the sperm, allowing them to survive and swim towards the egg. Once inside the female reproductive tract, the fructose is absorbed by the sperm and used to fuel their movement towards the egg. Without the fructose in semen, the sperm may not have enough energy to reach the egg and fertilize it.
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R. Scientific errors are factors that could have contributed to the uncertainty in the outcome of your experiment. Could measurements have been more accurate? Could you have performed more trials? Could environmental factors, such as the lab's lighting or temperature, have had an effect? State these possible sources of error and analyze or estimate how much they may have affected your results.
Answer:
Yes.
Explanation:
Yes, measurements should be more accurate if these scientific error are removed. Yes, we must perform more trials in order to verify the experiment. Environmental factors, such as the laboratory's lighting or temperature, has a great effect on the experiment and can cause error. In this experiment the errors occur such as instrumental, environmental, procedural, and human. All these error causes inaccurate readings of experiment so greatly affect the experiment.
When blood is flowing through a vena cava, which main blood vessel will it flow through next?
A hepatic portal vein
B hepatic vein
C pulmonary artery
D pulmonary vein
Answer:
C.
Explanation:
When the ventricle is full, the tricuspid valve shuts. This prevents blood from flowing backward into the right atrium while the ventricle contracts.
As the ventricle contracts, blood leaves the heart through the pulmonic valve, into the pulmonary artery and to the lungs, where it is oxygenated.
The four types of moveable joints are hi nge, ball-and-socket, pivot, and ____________________________.
rotating
gliding
sinking
floating
Answer:
answer is gliding joint
a Male peacock display his tail as a part of a what display
Answer:
I think it's to impress a female peacock.
How are the circulatory systems in animals and plants alike?
A- Their circulatory systems move blood throughout the organism
B- Their circulatory systems transport nutrients to cells
C-Both plants and animals have a pulmonary circuit
D- All plants and animals have a heart
Answer:
I think B
Explanation:
The circulatory system is the method of transport in plants and animals. Animals must have nutrients and oxygen reach every cell in their body. Plants must have nutrients and carbon dioxide reach every cell in their "body." The circulatory system is how these things are carried around the living organism.
What phases do cells go through during meiosis?
Explanation:
Since cell division occurs twice during meiosis, one starting cell can produce four gametes
hope this helps
The two birds shown in Figure A and B are found on one island. The bird species in figure A is moved to a new island, where food size and shape are different from the food found in their current island. The birds left behind (Figure B) on the original island continue to grow and reproduce.
What changes might a scientist expect to see in the species?
A.
The birds on the old island would not change over time and evolve.
B.
The birds on the new island would evolve over time and die out.
C.
The birds on the old island would evolve over time and develop adaptations in their beaks to allow them to eat new types of food.
D.
The birds on the new island would evolve over time and develop adaptations in their beaks to allow them to eat new types of food.
Answer:
D.
Explanation:
because if the birds in figure A move to the new island with new food size and shape they will adapt to the food
10. Deafness in cocker spaniels is inherited. The allele for deafness (d) is recessive to the allele for hearing (D). Two cocker spaniels that are heterozygous for hearing are mated together. What is the chance that a puppy will be deaf?
Question 10 options:
0%
25%
50%
100%
Answer:
25%
Explanation:
If they are both heterozygous, it means they both have a Dd genotype. If you draw out a punnet square Dd x Dd you end up with the following possible genotypes for the puppy:
DD, Dd, Dd, dd
In order for the puppy to be deaf, it must be dd since deafness is recessive, which is 1/4 (25%)
The chance that the puppy will be deaf is 25%. The correct option is B.
What is allele?The term "allele" refers to the alternative form or versions of a gene. People inherit one allele for each autosomal gene from each parent, and we tend to categorize the alleles.
We usually refer to them as normal or wild-type alleles, or abnormal or mutant alleles.
If they are both heterozygous, they have the Dd genotype. As per the Punnett square Dd x Dd, one can see the the following genotypes for the puppy:
DD, Dd, dD, dd
Because deafness is recessive, the puppy must be dd, which is 1/4 of the population.
Thus, the correct option is B.
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How do keystone species shape communities?
Explanation:
A keystone species is an organism that helps define an entire ecosystem. By keeping populations of mussels and barnacles in check, this sea star helps ensure healthy populations of seaweeds and the communities that feed on them—sea urchins, sea snails, limpets, and bivalves.
Answer:
By keeping populations of mussels and barnacles in check
If a parent cell has 20 chromosomes, how many daughter cells will it have if the cell divides by Mitosis?
Answer:
After mitosis, the daughter cell has 20 chromosomes and after meiosis, the daughter cell has 10 chromosomes.
Answer:
10 chromosomes
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why does animal viruses affect only animal but not to the plants?
Heriberto wanted to compare the gravity on the moon to the gravity on earth which statement below is correct
This question is incomplete; here is the complete question:
Herberto wanted to compare the gravity on the Moon to the gravity on Earth. Which statement below is correct?
The gravity on Earth is less than the gravity on the Moon.
The gravity on Earth is greater than the gravity on the Moon.
The gravity on Earth is equal to the gravity on the Moon
The gravity on Earth is the same as the gravity on the Moon.
The correct answer is The gravity on Earth is greater than the gravity on the Moon.
Explanation:
One of the factors that most affect the gravity (the force that makes objects move towards the center of a body) of planets like Earth or smaller bodies such as the moon is the mass. Indeed, if the celestial body is more massive or contains more mass the gravity force is stronger. Now, the mass of Earth is higher than the one of the moon. This makes the gravity of the moon weaker. Indeed, the gravity on Earth is 9.8 meters per square second, while the one in the moon is 1.62 metes per second, which is about 1/6th of the gravity on our planet.
What are similarities and differences between the structures of DNA and RNA?
Answer:
The similarities and differences between DNA and RNA are given as follows:
Explanation:
Similarities:
Both are made up of nucleotides
Nucleotides are made up of nitrogenous bases, a pentose sugar, and the phosphate backbone.
Both DNA and RNA have four nitrogenous bases each - two purines two pyrimidines
Purine binds with pyrimidines
Differences
DNA uses the nitrogenous bases adenine, cytosine, thymine, and guanine whereas RNA uses adenine, cytosine, uracil, and guanine. Uracil lacks a methyl group on its ring
RNA contains the sugar ribose that has an extra -OH while DNA contains the deoxyribose sugar that has H at the 2 carbon.
DNA is double-stranded while RNA is a single-stranded
Under alkaline conditions, DNA is stable while RNA is not stable.
A chemical which consists of just one kind of atom is always:
a molecule
an element
a mineral
a rock
(GIVING BRAINLIEST!!)
Which water reservoir contains frozen fresh water?
A) Rivers
B) Glaciers
C) Lakes
D) Oceans
Answer:
Glaciers
Explanation:
About three-quarters of Earth's freshwater is stored in glaciers. Therefore, glacier ice is the second largest reservoir of water on Earth and the largest reservoir of freshwater on Earth.
hope it helps!
Explain the difference between homology and analogy using a wolf, a whale, and a shark:
Answer:
Explanation:
Analogy refers to traits or structures like body shapes, fins which evolved independently that are similar in organisms that are not related by the same common ancestor. For example dolphins and shark have similar body structures like fins but they are unrelated. Whale and shark too. Whales are mammals, sharks are fish.
Homology refers to traits or structures
posses by organisms that are related by common ancestors. Example wolf and whales.....they are both mammals.
What is the role of DNA in hereditary ?
Answer:
DNA is the genetic information used to make proteins, and it contains the hereditary traits of organisms. There are two types of DNA: mitochondrial DNA, which you can only get from your mother, and nuclear DNA, which is a combination of both your ancestors' DNA.
They showed that adult cells could be reprogrammed to become cells with the properties of an embryonic stem cells
Answer: Kathrin Plath and William Lowry
Explanation:
Kathrin Plath and William Lowry and researchers at the University of California in Los Angeles(UCLA) were able to reprogram adult cells to become develop properties of embryonic stem cells which are very important as they can become any type of cell in the body which can have very important implications in medicine.
They did this by genetically altering the cells to enable them age backwards to a point where they were like the aforementioned stem cells.
is protein production active or passive transport and why
Answer:
If the solute carries a net charge, however, both its concentration gradient and the electrical potential difference across the membrane, the membrane potential,influence its transport. ... Thus, transport by carriers can be either active or passive, whereas transport by channel proteins is always passive.
Explanation:
Which type of organism would MOST likely benefit directly from increased levels of CO2?
- fish
- bird
-tree
- mushroom
Answer:Im pretty sure its a tree or mushroom
Explanation:
The study of microorganisms is called microbiology.
The correct answer to the question is option D which is mushroom.
What is anaerobic respiration?Anaerobic respiration is respiration using electron acceptors other than molecular oxygen.Although oxygen is not the final electron acceptor, the process still uses a respiratory electron transport chain.According to the question, the fungi are saprotrophic species and an increased level of CO2 will help them to grow.
Hence, the correct answer is option D.
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Identify and explain at least five ways you can apply the concept of
the cell cycle in your own life.
Answer:
Growth of existing cells in G1
Creating replacement cell for expired cells (apoptosis)
Repair of damaged tissues
Regulates body cells to maturation
Prevents out of control cell cycle leads to cancer
Slowing the reproduction of some cells such as neurons G0
Producing identical cells to the one that already exist to maintain shape, structure and functions of cells in the human body
Explanation: