Question

Identify the amino acids containing nonpolar, aliphatic R groups.

(a) Phenylalanine, tyrosine, and tryptophan

(b) Glycine, alanine, leucine

(c) Lysine, arginine, histidine

(d) Serine, threonine, cysteine

This question was addressed to me by my school principal while I was bunking the class.

I'm obligated to ask this question of Amino Acids topic in division Amino Acids, Peptides and Proteins of Biochemistry

Answer 1

Correct option is (b) Glycine, alanine, leucine

Easiest explanation: Glycine:  H3 N^+ – CH2 – COO^–

Alanine:  H3 N^+ – CH(CH3) – COO^–

Leucine:  H3 N^+ – CH(C4 H9) – COO^–.