Question

What elements make up proteins?

Is it carbon, oxygen, hydrogen, and nitrogen?

Or is it carbon, oxygen. hydrogen, nitrogen, and sulfur?

Answer 1

Proteins, being made up a diverse set of amino acids, have, in addition to carbon, hydrogen, oxygen, and nitrogen, the elements sulfur and selenium. ^.^

Answer 2

1 nitrogen 2 potassium 3 phosphorus 4 calcium

Answer 3

Calcium