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il63 [147K]
2 years ago
8

Explain why nitrogen Is Important to organisms. A:Nitrogen is necessary in order for organisms to reproduce. B:Nitrogen is neces

sary in order to make energy. C:Nitrogen is necessary to help protect organisms from its natural predators. D:Nitrogen is necessary to make proteins.​
Biology
1 answer:
Alinara [238K]2 years ago
8 0
D) nitrogen is necessary to make proteins
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Monica [59]
A is a correct answer.

Dermis is does not had contain significant amounts of the protein collagen.

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3 years ago
Why is salivary amylase active for only an hour or so, whereas lingual lipase isn't active until reaching the stomach
leva [86]

Salivary amylase will be active for only an hour or so because the optimum pH for activity of amylase is about 6.7–7.0 which is available in the mouth but the pH of the stomach is acidic around 1-2 due to which the amylase enzyme becomes inactive in short-time.

The lingual lipase enzyme is present in the saliva but isn't active until reaching the stomach because this enzyme is acid stable and works efficiently in the stomach, not in the mouth.

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3 0
2 years ago
What is the purpose of spindle fibers during mitosis?
Sonja [21]

Answer:

I think the answer Is divide the cell in half and see the explanation

Explanation:

Spindle fibers form a protein structure that divides the genetic material in a cell. The spindle is necessary to equally divide the chromosomes in a parental cell into two daughter cells during both types of nuclear division: mitosis and meiosis

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Why do biologists measure the number of trophic levels in an ecosystem?
slega [8]

Answer:

Biologists measure the number of trophic levels in an ecosystem so as to check its stability and health.

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Trophic levels are the feeding position in a food chain such as primary producers, consumers, etc. They are positions that an organisms occupies in a food chain (series of steps in which organisms transfer energy by eating or being eaten);- what it eats and what eats it. 

Theoretically there is no any limit to the number of trophic levels in a food chain or number of organisms that live on each level.

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When blood glucose levels increase above set point, the hormone insulin, which is produced in the beta cells of the Islets of Langerhans in the pancreas, is secreted into the bloodstream. The insulin binds to insulin receptors on cell membranes of liver cells, which results in accelerated conversion of glucose to glycogen, and a slower conversion of glycogen to glucose. This caused blood glucose levels to fall back to normal range again.

7 0
3 years ago
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