Before a cell begins the process of DNA replication, it must pass through the following step of the cell cycle:
B. S phase
During the S phase of the cell cycle, DNA replication occurs. This is when the cell duplicates its DNA to prepare for cell division. The S phase follows the G1 phase and precedes the G2 phase. In the G1 phase, the cell grows and prepares for DNA replication, and in the S phase, the actual replication of DNA takes place.
Passing through the S phase is crucial for the cell to ensure that each daughter cell receives a complete set of genetic material during cell division. Once DNA replication is successfully completed in the S phase, the cell can then proceed to subsequent steps such as the G2 phase and mitosis, ultimately leading to cell division.
