Question

Two amino acids of the standard 20 contain sulfur atoms. They are: A) cysteine and serine. B) cysteine and threonine. C) methionine and cysteineD) methionine and serine E) threonine and serine.

Answer 1

The two amino acids of the standard 20 that contain sulfur atoms are cysteine and methionine. Cysteine contains a thiol (-SH) group, which contains a sulfur atom, while methionine contains a sulfur atom in its side chain. Threonine and serine do not contain sulfur atoms in their side chains.

~~~Harsha~~~