NEET Previous Year Question
In sea urchin DNA, which is double stranded, 17% of the bases were shown to be cytosine. The percentages of the other three bases expected to be present in this DNA are :
Topic: NEET PYQ
Answer: C. Full step-by-step solution below.
- AG 34%, A 24.5%, T 24.5%
- BG 17%, A 16.5%, T 32.5%
- CG 17%, A 33%, T 33%
- DG 8.5%, A 50%, T 24.5%
Correct answer: C
Solution
(c) According to Chargaff's rule:C = G and A = T
If C = 17%, then G = 17%
Remaining = 100 − (17 + 17) = 66%
Therefore, A = T = 33%
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