MHT CET Biology question

The DNA from the bacteriophage has a base composition of 25 % A, 33% T, 24% G and 18% C, which of the following best explains this observation?

(A)In viral genome, the base pairing does not follow the standard Watson and Crick rules and allows G - A and C - T base pairs
(B)Viral genomes are linear & tolerate base pair mismatches
(C)Nucleic acids from viruses are tightly complexed with nucleic acid binding proteins and so, cannot lose pair another
(D)The genome of bacteriophage is single-strandedCorrect

Answer: (D)

Solution

Chargaff's equality (A = T, G = C) holds only for double-stranded DNA; here A T and G C, so the genome is

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Question ID VK-065639