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In DNA, guanine pairs with

  • A.Adenine
  • B.Cytosine
  • C.Thymine
  • D.Uracil

Answer: B

Correct answer: Cytosine

G pairs with C, held by three hydrogen bonds - one more than the A-T pair, which is why GC-rich DNA takes a higher temperature to melt. Uracil appears in RNA, where it pairs with adenine.

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