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Biomolecules and Polymers: Nucleic acids MCQ

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Nucleic acidsEasyQuestion 870003

Question

DNA contains the base pairs:
  1. A
    A−T and G−C (adenine-thymine, guanine-cytosine)
    Correct
  2. B
    A−U and G−C
  3. C
    A−C and G−T
  4. D
    All four bases pair randomly

Correct answer

A−T and G−C (adenine-thymine, guanine-cytosine)

Explanation

Watson-Crick base pairing in DNA: A pairs with T (2 H-bonds), G pairs with C (3 H-bonds). In RNA, T is replaced by U (uracil). The complementary base pairs hold the double helix together.

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