The simplest amino acid is_________?
Correct answer: B. glycine
- A. alanine
- B. glycine
- C. valine
- D. phenylalanine
Explanation
Glycine is the simplest amino acid because its side chain is only a hydrogen atom, giving it the smallest possible amino-acid structure. Alanine is a common mistaken choice because it is also simple, but its side chain contains an additional methyl group.
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