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12th Class Biology Sample Paper Biology - Sample Paper-1

  • question_answer
    If a double stranded DNA has 20 per cent of cytosine, calculate the per cent of adenine in the DNA.

    Answer:

    Cytosine = 20%, therefore Guanine = 20%
    According to Chargaffs rule,
    A+T=100 - (G+C)
    A + T = 100 - 40. Since both adenine and thymine are in equal amounts,
    \[\therefore \]      Thymine = Adenine \[=\frac{60%}{2}=30%\] 
                                                                                                                                                                                                                    


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