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10. Biomolecules — Chemistry STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 ScienceChemistry10. Biomolecules1 Mark
MCQ
Which one of the following statements is correct?
  • A
    All amino acids except lysine are optically active
  • B
    All amino acids are optically active
  • ✓
    All amino acids except glycine are optically active
  • D
    All amino acids except glutamic acids are optically active
✓

Answer

Correct option: C.
All amino acids except glycine are optically active
c
With the exception of glycine all the $19$ other common amino acids have a uniquely different functional group on the central tetrahedral alpha carbon

$\mathop {\begin{array}{*{20}{c}}
{H\,\,\,\,\,\,\,\,\,\,\,\,}\\
{\,\,\,|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}\\
{H - C - COOH}\\
{\,\,|\,\,\,\,\,\,\,\,\,\,\,\,\,}\\
{\,N{H_2}\,\,\,\,\,\,\,\,}
\end{array}}\limits_{{\rm{Glycine}}} $

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