Chhattisgarh PMT Chhattisgarh PMT Solved Paper-2009

  • question_answer
    An analysis of a DNA (double stranded) sample yielded 18% cytosine. What would be the percentage of other bases in this sample?

    A)  \[T-32%,\text{ }A-32%,\text{ }G-18%\]

    B)  \[T-32%,A-18%,G-32%\]

    C)  \[T-18%,\text{ }A-32%,\text{ }G-32%\]

    D)  \[1-40%,\text{ }A-22%,\text{ }G-20%\]

    Correct Answer: A

    Solution :

    According to Chargaff's rule, in DNA purines and pyrimidines are always in equal proportion (ie, A + G = T + C) and proportion of adenine is always equals to that of thymine, while proportion of guanine always equals to that of cytosine (;e, A = T and G = C). So, option 'a' is correct.


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