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Which enzyme catalyzes the elongation of DNA molecules?

  • A.DNA polymerase
  • B.Helicase
  • C.DNA ligase
  • D.Primase

Answer: A

Correct answer: DNA polymerase

DNA polymerase is the elongating enzyme: it adds nucleotides one at a time to the 3’ end of a primed strand, choosing each to pair with the template. Helicase unwinds, primase starts the chain, and ligase seals nicks - none of them extends it.

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