DNA Structure and Replication
What does ligase do during replication of DNA?

Joins nicks in DNA strands
Synthesizes the lagging strand
Digests mRNA when it is no longer needed
Makes copies of mRNA from DNA

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DNA Structure and Replication
Taylor, Woods and Hughes labeled Vicia DNA by allowing new DNA synthesis in the presence of radioactive thymine. After DNA replication (S phase of the cell cycle), it was observed that

both (a) and (b)
neither chromatid was labeled
both chromatids of a chromosome were labeled
only one chromatid of a chromosome was labeled

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