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DNA replication takes place in which direction?

  • A.3’ to 5’
  • B.5’ to 3’
  • C.Randomly
  • D.Vary from organism to organism

Answer: B

Correct answer: 5’ to 3’

The new strand always grows 5’→3’, because polymerase can only add to a free 3’-OH. The template is read in the opposite sense, 3’→5’. This single restriction is why the lagging strand has to be built from Okazaki fragments.

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