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If Adenine makes 30% of the DNA molecule, what will be the percentage of Thymine, Guanine and Cytosine in it?

  1. A
    T : 30; G : 20; C : 20
  2. B
    T : 20; G : 25; C : 25
  3. C
    T : 20; G : 30; C : 20
  4. D
    T : 20; G : 20; C : 30

Solution & Step-by-step Explanation

According to Chargaff's Rule: [A]=[T] and [G]=[C].
If A=30%, then T=30%.
Sum of A+T=30%+30%=60%.
Remaining portion for G+C=100%−60%=40%.
Since G=C, then G=20% and C=20%.

Practice this question

Try it yourself before checking the explanation above.

If Adenine makes 30% of the DNA molecule, what will be the percentage of Thymine, Guanine and Cytosine in it?
A
T : 30; G : 20; C : 20
B
T : 20; G : 25; C : 25
C
T : 20; G : 30; C : 20
D
T : 20; G : 20; C : 30

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