GATE 2024 ES – Question 45
Which DNA statements are correct?
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Correct answer: (A) DNA is composed of nucleotides.; (C) Each backbone phosphate links two deoxyribose units in a strand.
Explanation
DNA is a nucleotide polymer with the usual four bases A, T, G, C. Internal backbone phosphates form3′–5′ phosphodiester links between adjacent deoxyribose units. Base pairing enforces A=T and G=C, rather than A=G. Thus the intended correct statements are **A, C**. C describes backbone phosphates; terminal phosphate end groups are a qualification to its word each.