DNA Structure and Replication
The role of primase is to

cleave and unwinds short sections of DNA ahead of the replication fork
dismantle RNA primer
proofread base pairing
synthesize an RNA primer to begin the elongation process

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

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