Question

question 30
proteins are composed of which of the following elements?
a carbon and hydrogen
b carbon, hydrogen, and oxygen
c hydrogen and oxygen
d carbon, hydrogen, oxygen, and nitrogen

Explanation:

Proteins are macromolecules. They are composed of amino acids. Amino acids contain carbon (C), hydrogen (H), oxygen (O), and nitrogen (N) atoms.

Answer:

D. Carbon, hydrogen, oxygen, and nitrogen