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Molecular Basis of Inheritance question

2015 · Q61
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Molecular Basis of Inheritance question

2015 · Q61

NEETBiologyMolecular Basis of InheritanceMCQ+4 / −1
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
  1. A
    G 17%, A 16.5%, T 32.5%
  2. B
    G 17%, A 33%, T 33%
  3. C
    G 8.5%, A 50%, T 24.5%
  4. D
    G 34%, A 24.5%, T 24.5%
View written solutionFree

Correct answer: B

Chargaff’s rule states that A = T and G ≡ C. The molar amount of adenine = molar amount of thymine. The molar amount of guanine = molar amount of cytosine.
Hence,
G is 17%, so, C = 17%
A = 33%, so, T = 33%

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