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Aliun [14]
3 years ago
10

A cell membrane that allows only certain substances to enter or leave it

Biology
1 answer:
irina [24]3 years ago
3 0
That would have to be the cell membrane an animal cell
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#9 I need help please
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Answer:

500 amino acids

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Yes

Explanation:

A codon is a set of 3 base pairs. Each codon codes for a specific amino acid. So the ratio between codon and amino acid is 1:1 and the ratio between base pairs and codon is 3:1.

If you have 1,500 base pairs then we can mathematically solve the number of codons:

\dfrac{1,500}{x} = \dfrac{3}{1}\\\\(1,500)(1) = (3)(x)\\\\\dfrac{1,500}{3} = x\\\\ 500=x

Since the ratio of codon to amino acid is 1:1, then for every 500 codons, there are 500 amino acids.

I hope this helps clear it up a bit for you.

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D should be the answer
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Which of the following monomers vary based on the structure of their side chains?
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Maslowich

Answer:

The answer is A.

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