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10. Biomolecules — Chemistry STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 ScienceChemistry10. Biomolecules1 Mark
MCQ
The optically inactive amino acid is
  • A
    Lysine
  • ✓
    Glycine
  • C
    Arginine
  • D
    Alanine
✓

Answer

Correct option: B.
Glycine
b
All amino acids have an amine and a carboxyl group They also have a functional group which is unique to each of them. Depending on the polarity of the functional group the amino acid can be rendered optically inactive or active. The simplest of all amino acids, Glycine which has $H$ as a functional group lacks optical acitivity, as the saturated alpha carbon is unsubstituted. Others among the $20$ amino acids have $D$ or $L$ stereoisomers. So, the correct answer is $'Glycine'.$

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