HURRY! Which best describes the structure of the molecules that make up proteins?

O

A. Carbon + hydrogen + oxygen

B. Phosphate + sugar ring + nucleotide base

O

C. Hemoglobin + oxygen + iron

O

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