Question

Question #8df2f

Answer 1

Being amino acids' polymer; proteins mostly constitute nitrogen, oxygen, carbon and nitrogen & sometimes they also contain sulfur and phosphorus.

Explanation:

Proteins are actually polypeptide chains of amino acids(monomers).

So as we can see in the above figure that amino acid contain hydrogen, carbon, nitrogen and oxygen as essential elements. And R is variant which means that amino acids could be very diverse depending upon the nature of `R`-`group`.

As in case of methionine and cysteine amino acids, the variant side chains R contain sulfur.

And as far as phosphorus is concerned then it's found only in some proteins which are subject to post translational modifications, such as phosphorylation.

Hope it helps...