alleryWhich amino acid is not optically active?
AAlanine
BLeucine
CCysteine
DGlycine
Answer & Solution
Correct answer: D. Glycine
1. Optical activity needs an asymmetric alpha carbon.
2. Glycine has only hydrogen as its side chain.
3. Its alpha carbon is therefore symmetric.
_Source: syllabus Chemistry Part 2, Unit 10 'Biomolecules'_
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