BiologyA DNA molecule is 160 base pairs long. If it has 20% adenone, how many cytosine bases are present in this DNA molecule?

A DNA molecule is 160 base pairs long. If it has 20% adenone, how many cytosine bases are present in this DNA molecule?

  1. A

    45

  2. B

    64

  3. C

    96

  4. D

    192

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    Solution:

    Total no of bases= 160×2= 320
    According to Chargaff's rule A=T and G=C
    So A=20% then T= 20%
    Therefore G= 30% C=30%
    Cytosine bases= 320×30/100= 96

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