Hurry ! which best describes the structure of the molecules that make up proteins?
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a. carbon + hydrogen + oxygen
b. phosphate + sugar ring + nucleotide base
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c. hemoglobin + oxygen + iron
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d. carboxyl group + amino group + side chain

The answer is D!
there is a carboxyl group (COOH) an amino group (NH2) , and a side chain (different elements arranged in different structures. this determines what kind of amino acid it is). this option describes the structure of amino acids

A gives the name of some of the elements found in proteins but not the structure.

B gives the structure for DNA/ RNA

C gives a type of protein and two elements; not a structure

Ais the answer for you