If the $DNA$ codons are $ATG\ ATG\ ATG$ and a cytosine base is inserted at the beginning, which of the following will result

  • [AIPMT 1995]
  • A

    A non-sense mutation

  • B

    $CA\ TGA\ TGA\ TG$

  • C

    $CAT\ GAT\ GAT\ G$

  • D

    $C\ ATG\ ATG\ ATG$

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  • [AIIMS 2015]

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