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STD 12 - 5. molecular basis of inheritance — Biology STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 ScienceBiologySTD 12 - 5. molecular basis of inheritance1 Mark
MCQ
The one aspect which is not a silent feature of genetic code, is its being
  • A
    degenerate
  • ✓
    ambiguous
  • C
    universal
  • D
    specific.
✓

Answer

Correct option: B.
ambiguous
b
(b) : Genetic code is non­ambiguous. Non­ ambiguous code means that there is no ambiguity about a particular code. One codon specifies only one amino acid and not any other. There are $64$ codons. Out of $64, 3 $ are stop codons or nonsense codons, $i.e.$, these do not code for any amino acid and rest $61$ code for one of the $20$ amino acids. Neither of them code for more than one amino acids except $GUG$ which normally code for valine but in certain conditions it also codes for N­formyl methionine as initiation codon.

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