Question

2 dna replication occurs during the cell cycle in preparation for mitosis. the double helix is unzipped by the helicase enzyme, and dna polymerase binds nucleotides to each strand using complementary base pairing. during which phase of the cell cycle does dna replicate, and which model is used? a metaphase, semiconservative b g₁ phase, conservative c s phase, semiconservative d g₂ phase, dispersive

Explanation:

DNA replication occurs during the S - phase of the cell cycle. The semi - conservative model of DNA replication is the accepted model, where each new DNA molecule consists of one old strand and one new strand. Metaphase is part of mitosis and not when DNA replication occurs. In the G₁ phase, the cell grows and prepares for DNA replication but replication doesn't happen here. In the G₂ phase, the cell prepares for mitosis after DNA replication has already occurred. The conservative and dispersive models have been disproven in favor of the semi - conservative model.

Answer:

C. S phase, semiconservative