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Which of these statements are INCORRECT according to chargaff’s rules?

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Which of these statements are INCORRECT according to chargaff’s rules?

(a) The molar ratio of A to T or C to G = 1

(b) The sum of purine = sum of pyrimidine

(c) The % C+G ≠ % A+T

(d) The composition of DNA remains the same in all the species

I got this question at a job interview.

Question is taken from Nucleic Acids in section Biomolecules and Catalysis of Life Sciences

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The correct choice is (d) The composition of DNA remains the same in all the species

The explanation is: Erwin Chargaff proposed two rules which played a significant role in the discovery of the double helix structure of DNA. According to its second rule, the composition of DNA varies from one species to other. Statement composition of DNA remains the same in all the species is incorrect.

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