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Paladinen [302]
2 years ago
12

Animals are totally dependent on plants and microorganisms for nitrogen fixation and nitrate assimilation because animals: A. do

not have the reducing power (NADPH) to fix nitrogen. B. lack the enzyme aminotransferase. C. lack the enzymes to reduce N2 and NO3- to NH4+. D. lack carbamoyl-phosphate synthetase I. E. lack glutamate dehydrogenase.
Biology
1 answer:
ale4655 [162]2 years ago
7 0

Answer:

C. lack the enzymes to reduce N2 and NO3- to NH4+

Explanation:

Nitrogen fixation is a process by which atmospheric nitrogen (N2) is converted into ammonia (NH3) so that can be used in metabolic pathways (e.g. biosynthesis of macromolecules). Nitrogen fixation is performed by Archea and bacteria such as Azotobacter (usually in symbiosis with Leguminosa plants).

Nitrogen assimilation is a process in which organic compounds are made from inorganic nitrogen.

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Distribution of phenotypes within a population may be impacted by different types of natural selection. These types of selection include;
Directional selection involves a change in the environment shifts of phenotypes observed. Example is the giraffe neck-length, where the length got longer and longer over time to reach the leaves at the top of trees.
Stabilizing selection , this is a selection where an average phenotype is favored. example is number of eggs laid by birds such that too many eggs will be a waste of energy because some chicks would starve.
Disruptive selection is a selection where individuals with an average value of a trait are affected most while those with values below average are affected least. Example small individuals are capable of hiding from predators while big individuals can not fit in the hiding place but instead will fight with predators.

8 0
2 years ago
Colchicine is a toxin that binds to tubulin proteins and prevents microtubules from elongating. What effect might this have on d
lianna [129]

The effect Colchicine might have on dividing cells is that the duplicated chromosomes might not be able to segregate into daughter nuclei.

Colchicine is an alkaloid that attaches to tubulin and prevents it from polymerization to microtubules. As we know that Microtubules are a component of the cytoskeleton of a cell that aids in molecular mobility inside the cell.

During cell division, chromatin condenses into chromosomes, which are then connected to microtubules. The chromosomes are separated into daughter cells by microtubules.

When these cells are treated with colchicine, tubulin polymerization to microtubules may not occur, and the chromosomes containing daughter nucleic might not be separated.

Learn more about chromosomes here:

brainly.com/question/2583209?referrer=searchResults

8 0
2 years ago
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bogdanovich [222]

Answer:

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Explanation:

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7nadin3 [17]

Explanation:

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