Which of the following pair of amino acids has polar but neutral side chains?
A) cysteine and methionine
B) cysteine and serine
C) histidine and methionine
D) phenylalanine and tryptophan

Question

Quizplus · Accepted Answer

Cysteine has a polar but slightly acidic side chain due to the thiol group. Methionine has a nonpolar side chain. Histidine has a polar but slightly basic side chain. Phenylalanine and tryptophan have nonpolar side chains. Serine also has a polar side chain that is neutral, making it a better fit for the question along with cysteine.

Which of the Following Pair of Amino Acids Has Polar