* Cell Cycle: The cell cycle is a series of events that take place in a cell leading to its division and duplication. It consists of four phases:
* G1 phase (Gap 1): The cell grows and carries out its normal functions.
* S phase (Synthesis): DNA replication occurs, creating two identical copies of the original DNA molecule.
* G2 phase (Gap 2): The cell continues to grow and prepares for mitosis.
* M phase (Mitosis): The cell divides its nucleus and cytoplasm, creating two daughter cells.
* S phase: This is the crucial phase for DNA replication. It's the period when:
* The cell's DNA is unwound and unzipped.
* Each strand of DNA acts as a template for creating a new complementary strand.
* Enzymes like DNA polymerase are involved in adding nucleotides to the new strand, following base-pairing rules (A with T, and C with G).
* The result is two identical DNA molecules, ready to be passed on to the daughter cells during mitosis.
Therefore, DNA synthesis is a tightly regulated process that takes place only during the S phase of the cell cycle to ensure accurate duplication of the genetic material.
