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When DNA polymerase is in contact with guanine in the parental strand, what does it add to the growing daughter strand?

  • A.Phosphate
  • B.Cytosine
  • C.Uracil
  • D.Guanine

Answer: B

Correct answer: Cytosine

Base pairing is fixed by hydrogen bonding: G pairs with C through three hydrogen bonds, and A with T through two. So a guanine on the template directs the insertion of a cytosine. Uracil belongs to RNA, not DNA.

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