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Question: Answered & Verified by Expert
If Adenine makes 30% of the DNA molecule, what will be the percentage of Thymine, Guanine and Cytosine in it?
BiologyMolecular Basis of InheritanceNEETNEET 2021
Options:
  • A T: 20 ; G: 30 ; C: 20
  • B T: 20 ; G: 20 ; C: 30
  • C T: 30 ; G: 20 ; C: 20
  • D T: 20 ; G: 25 ; C: 25
Solution:
2630 Upvotes Verified Answer
The correct answer is: T: 30 ; G: 20 ; C: 20
According to Chargaff's principle, A is equal to T and G is equal to C. Hence, if the total is 100 and A is 30 then T will also be 30. Likewise G+C will be 40, so, G=20,C=20.

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