Answer:
The correct answer is d
Explanation:
Allosteric enzymes have multiple binding sites to different ligands called allosteric sites (different from the active site), these ligands can modify their kinetic properties. They are generally made up of more than one polypeptide chain, and have a quaternary structure, an enzyme with a quaternary structure can bind more than one substrate molecule. An allosteric enzyme is an enzyme whose activity is regulated by an allosteric center, which is a site, other than the active center of the enzyme, to which a regulator (called an allosteric regulator) binds in a reversible and non-covalent manner. The binding of this regulator modifies the three-dimensional structure of the enzyme and affects the configuration of the active site, thus increasing or decreasing its activity, depending on the case. The allosteric sites present in regulatory enzymes is where allosteric effectors or inhibitors are attached, causing a conformational change in the substrate binding site or catalytic site, thus regulating enzyme activity.
Answer:
d. depends on changes in their quaternary structure on binding of substrates or inhibitors
Explanation:
Allosteric enzymes are oligomeric proteins composed of subunits or polypeptidic chains. They have a quaternary structure -many subunits and active sites- and express two states, R and T. Both states establish an equilibrium, with or without a joint ligand.
When the transition from one state to the other occurs, symmetry is conserved, but the affinity of a site to a ligand is altered. When a substrate joins one of the sites, it affects other binding sites.
Allosteric enzymes can change their conformation, exhibiting active and inactive conformations as a result of substrate binding at the activated center and regulatory molecules at other binding sites -allosteric centers-.
What drives subduction at a converging plate boundary?
Answer:
The geologic features related to convergent boundaries vary depending on crust types. Plate tectonics is driven by convection cells in the mantle. ... Subduction begins when this dense crust converges with less dense crust. The force of gravity helps drive the subducting slab into the mantle
what do dna evidence and the fossil record indicate are the ancestors of the living cetaceans, the mammalian group that includes whales, dolphins, and porpoises?
DNA evidence and the fossil record indicate are the ancestors of the living cetaceans were land-dwelling mammals. DNA evidence allows to trace the evolutionary origin of taxonomic groups.
DNA evidence refers to the linear order of nucleotides, which can be used to trace the evolutionary origin of a particular taxonomic group.
When the linear order of DNA nucleotides is conserved, it is known as sequence homology.
Fossils are preserved remains of organisms that once lived on the Earth, which can also be used as evidence to trace the evolutionary origin of a given group.
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Pioneer species are the first species
to appear after a disturbance. What
is one significant characteristic of
pioneer species?
A. They are not adapted to their surroundings.
B. They are very tolerant of extreme conditions.
C. They are the end product of secondary
succession.
A predator prey relationship. in which the populations rise and fall in response to each other is an example of
A -A positive feedback loop
B - A negative feedback loop
C - A manmade feedback loop
D - all of the above
Answer:
the answer is d (all of the above)
Explanation:
no
Antheridium is similar to Archegonium in all of the following except
The chromosomal set
Their site on the gametophyte is convergent
Number of the gametes produced by each one
Type of division in each one
Answer:
Explanation:
An archegonium (pl: archegonia), from the ancient Greek ἀρχή ("beginning") and γόνος ("offspring"), is a multicellular structure or organ of the gametophyte phase of certain plants, producing and containing the ovum or female gamete. The corresponding male organ is called the antheridium.
the size and complexity of the human language has made developing _____ systems difficult.
Answer:
snesnes
Explanation:
the size and complexity of the human language has made developing Natural-language processing systems difficult.
What is Natural-language processing system ?Natural language processing defined as an automated machine which process and interpret human languages.
The natural language processing system provides a question and answer set that is particularly useful with databases.
The natural-language processing (nlp) system interfacing activity involves accepting human language as input, carrying out the corresponding command, and generating the necessary output.
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Cross a heterozygous black rabbit with a heterozygous black rabbit. What is the
Genotype Percentages? What is the Phenotype Percentages? (How many will be
black, How many white? Percentages of BB Bb & bb)
Explanation:
Bb x Bb
1BB, 2Bb, and 1 bb
Let B=black fur allele(dominant) and b=white fur allele(recessive),
¾ of the rabbit will be black while ¼ will be white.
Hence,
¾×100%=75%
¼×100%=25%
According to the text, adolescents are deficient in their intake of necessary vitamins and minerals because _____
Answer:
healthy foods cost more.
unhealthy foods are more desirable.
they eat from vending machines in schools.
All of these answers are correct.
Explanation:
Which pair of traits is most likely to be inherited together?
A. purple eye and brown eye because they are both eye traits
B. aristaless and speck body because they have the greatest chance of crossing over
O
C. curved wing and arc (bent wings) because they have the least chance of crossing-over
D. black body and light eye because they are closest together on chromosome 2
Answer:
D
Explanation:
The closer together two genes are on a chromosome, the less likely their alleles will be separated by crossing-over.
what hormone do the c-cells secrete, and what is the function of this hormone?
Answer:
Calcitonin is one of those critical hormones. Calcitonin is a hormone that the C-cells in the thyroid gland produce and release. It opposes the action of the parathyroid hormone, helping to regulate the blood's calcium and phosphate levels. How does calcitonin work?
The hormone that the c-cell secrete is calcitonin. The function of calcitonin is a hormone that regulates the amount of calcium in your blood by decreasing it.
What are hormones?The important hormone is calcitonin. Calcitonin is a hormone produced and released by the thyroid gland's C-cells. It works in opposition to the activity of the parathyroid hormone, assisting in the regulation of calcium and phosphate levels in the blood.
Calcitonin is a hormone produced by the thyroid gland, which is a tiny, butterfly-shaped gland found near the throat. Calcitonin regulates how the body uses calcium.
Calcitonin is a cancer marker. Tumor markers are substances produced in the body by cancer cells or normal cells in response to cancer.
Thus, calcitonin is the hormone secreted by c-cells. Calcitonin is a hormone that controls the quantity of calcium in your blood by reducing it.
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Help in this two questions
Answer:
i dont know what it is i need points
The primary food for supplying energy for muscular activity is protein. Group of answer choices True False Next
Answer:
Carbohydrates, such as sugar and starch, for example, are readily broken down into glucose, the body's principal energy source. Glucose can be used immediately as fuel, or can be sent to the liver and muscles and stored as glycogen.
Human cells have 46 chromosomes. Each chromosome consists of a pair of identical chromatids attached together by a structure called a centromere. Once the chromosome has split, each chromatid is called a daughter chromosome. At the end of cytokinesis, how many daughter chromosomes will be found in each cell? Explain.
Answer:
92 daughter chromosomes.
Explanation:
There are 46 chromosomes in a normal cell and each chromosome turns into 2 daughter cells. So 46 plus 46 is 92.
You are maintaining a small population of fruit flies in the laboratory by transferring the flies to a new culture bottle after each generation. After several generations, you notice that the viability of the flies has decreased greatly. Recognizing that small population size is likely to be linked to decreased viability, the best way to reverse this trend is to cross your flies with flies from another lab.
A. True
B. False
What might explain the patterns of population density in northern Africa?
Answer:
Population density naturally varies a great deal within each country according to climatic conditions, topography, mineral deposits, rainfall, soil cultivation, etc
what is the name given to a virus that attacks a bacterium?
What does an alcoholic beverage contain that is a central nervous system depressant? 
Answer:
interferes with release of neural transmitter GABA
Explanation:
Alcohol is a central nervous system depressant, meaning it slows down brain functioning and neural activity. Alcohol does this by enhancing the effects of the neural transmitter GABA
depressants essentially "look" like the neural transmitter and so they go in and block the plasce in the brain between synapses, so when the body tries to release GABA, it appears as if it is already filled in, but in reality it is the alcohol that has filled it. once they start buidling up, they block enough that it impairs brain activity
Answer:
GABA
Explanation:
gamma-aminobutyric acid (GABA)
In general, did the simulated mice align with your predictions from the Punnett squares?.
Research studies are often carried out using mouse. From the study, the simulated mice was said to align with the predictions from the Punnett squares. So the answer is Yes.
The reason why some of the percentages did not exactly match your predicted results because the Mice don't have large litters, so the sample size was not large enough.
If the experiment is to be done again, I can improve upon experimental design by;
Increase the number of mice bred. Examine a different trait within mice. Examine a trait in another species. Test patterns for future generations.A lot of studies is been carried out on the Genetics of the mouse. The early development of inbred lines were studied. The mouse is known to be a good tool to identify the genetic basis of both normal and disease traits.
See full question below
In general, did the simulated mice align with your predictions from the Punnett squares?
(Choices: Yes, No)
Error Analysis: What might be the reason that some of your percentages didn't exactly match your predicted results?
Options are;
Gametes aren't responsible for inheritance. Mice don't have large litters, so the sample size was not large enough. The wrong type of mice were used.
If you did the experiment again, how could you improve upon the experimental design? Check all that apply.
Increase the number of mice bred. Examine a different trait within mice. Examine a trait in another species. Test patterns for future generations
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Answer:
The answer is yes....
Explanation:
how can you distinguish the dorsal from the ventral horns
What is secondary endosymbiosis?
A. a eukaryote envelops another eukaryote
B. a prokaryote preys upon a prokaryote
C. a prokaryote engulfs a eukaryote
D. a eukaryote overtakes a prokaryote
Answer:
Secondary endosymbiosis is when a living cell engulfs another eukaryote cell that has already undergone primary endosymbiosis. It has happened often enough that it has led to genetic diversity among the organisms on Earth.
Explanation:
hope this helps I don't know Its correct answer
How does your body respond to an increase in the need for energy----why would you need more energy?
Answer:
Exercise can boost energy levels by raising energy-promoting neurotransmitters in the brain, such as dopamine, norepinephrine, and serotonin, which is why you feel so good after a workout. Exercise also makes muscles stronger and more efficient, so they need less energy, and therefore conserve ATP.
Explanation:
Which statement best describes what is occurring in the diagram?
A- DNA is being replicated
B- RNA is being used as a template to make tRNA
C- RNA serves as a template to synthesize new DNA molecules
D- DNA serves as a template to make a strand of
Which of the following vitamins helps prevent night blindness?
A. Vitamin A
B. Vitamin C
C. Vitamin E
D. Vitamin K
Answer:
Vitamin A
Explanation:
Vitamin helps corrects deficiency and improve night blindness.
14. Which of the following occurs during the electron transport chain?
a. the formation of ATP by oxidative phosphorylation
b. the formation of water
c. a concentration gradient of protons
d. all of the above
Answer:
All
Explanation:
The electron transport chain is a series of four protein complexes that couple redox reactions, creating an electrochemical gradient that leads to the creation of ATP in a complete system named oxidative phosphorylation. It occurs in mitochondria in both cellular respiration and photosynthesis.
Answer:
D
Explanation:
ATP is created in the ETC
Water is formed as a by product
The concentration gradient is what fuels the ETC. Protons (H+ ions) move across the membrane to create energy.
Hope that helps (and also hope its right, i did bio a while back)
pls help!!
The following tracking model was created for Hurricane Ike on September 8, 2008. ^^
According to this model, at which point is the storm least likely to make landfall?
1) Point A
2) Point B
3) Point C
4) Point D
Answer:
Its Point A
Explanation:
The following tracking model was created for Hurricane Ike on September 8, 2008. Map of Gulf Coast showing the forecasted path of Hurricane Ike on September 8, 2008. The storm’s current location, as of 5 p.m. on Friday, is just south of Cuba, over the Caribbean Sea. The “cone of probability” extends northwest. Point A is located along the Texas coast, right in the center of the cone’s widest point. Point B is located along the coast of Louisiana, toward the easternmost edge of the cone. Point C is located further east, along the coast of the Florida Panhandle. Point D is located on the border between Mexico and Texas, toward the southwestern-most edge of the cone. According to this model, at which point is the storm least likely to make landfall?
which of the following are photosynthetic organisms?
Answer:
Plants, algae, and a group of bacteria called cyanobacteria are the only organisms capable of performing photosynthesis (Figure 1). Because they use light to manufacture their own food, they are called photoautotrophs (literally, “self-feeders using light”).
Sexual reproduction in animals depends on the production of gametes. Which of these processes produces gametes in animals?
Answer: in the ovaries of female, and the testes of male animals!!
Explanation:
The greatest number of relationships between the
organisms in an ecosystem is best shown in
A. a food chain
B. an energy pyramid
C. a food web
D. an ecological succession diagram
The greatest number of relationships between the organisms in an ecosystem is best shown in a food web. Thus, the correct option is C.
What is a Food web?A food web consists of all the food chains which are present in a single ecosystem. Each of the living thing in an ecosystem is a part of multiple food chains. Each food chain is one possible path that energy and nutrients may take as they move through the ecosystem.
For example- A hawk eats a snake, which has eaten a frog, which has eaten a grasshopper, which has eaten grass. It is a food web that shows the many different paths plants and animals are connected.
Therefore, the correct option is C.
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it can be said that all cells life begin and end with this process ?
Replication
Meiosis
Mitosis
Cytokinesis
all cells life begin and end with this process by the process of meiosis
What is meiosis ?
Meiosis is the process where a single cell divides twice to produce four four haploid daughter cells which are otherwise called as gametes; It can occur in two substages such as meiosis I and meiosis II.
Humans have 46 chromosomes in every cell, where 23 chromosomes t came from one of our parents and 23 very similar chromosomes that came from the other parents.
Meiosis I consist of substages like Prophase I where nuclear envelope disintegrates, Chromosomes begin to condense, Spindle fibres appear.
Secondly Prometaphase I where Spindle fibres attach to the centromere followed by Metaphase I where The homologous chromosomes align at the equatorial plate, Anaphase I where he homologous chromosomes move towards the opposite poles.
Telophase I where Spindle fibres disappear, Cytokinesis I where the cytoplasm and the cell division result in 2 non-identical haploid daughter cells.
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describe some of the adaptation of insects that allows them obtain their food from other organisms
Answer:
Parasitism
Explanation:
An example of this would be parasitism. It is a way in which some insects get food from other animals by living inside a host. It is a relationship in which the other animal is damaged while the parasite (in this case the insect) benefits.
