DNA replication occurs in how many phases
In animal cells, including human cells, the replication of the DNA genome occurs only at a specified time during the lifespan of the cell. This period is referred to as the synthetic or S phase. This is usually temporally separated from the mitotic, or M phase, by nonsynthetic periods referred to as gap 1 (G1 ) and gap 2 (G2 ) phases, occurring before and after the S phase, respectively (Figure 35-20). Among other things, the cell prepares for DNA synthesis in G1, and for mitosis in G2. The cell regulates DNA synthesis by allowing it to occur only once per cell cycle, and only during S-phase, in cells preparing to divide by a mitotic process.Ref: Harpers Illustrated Biochemistry, 30th edition, page no: 388
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Metabolism of nucleic acids