MCAT Question A Day - 5/9/14 - Answer!

Which of the following is NOT true concerning DNA replication?

A. DNA ligase links the Okazaki fragments

B. Helicase unwinds the DNA double helix.

C. Only the sense strand is replicated.

D. DNA strands are synthesized in the 5' to 3' direction

C is correct. DNA replication is semiconservative, which means that both strands are replicated, and each old strand is combined with a new strand.

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