Question

What happens in the G₁ checkpoint?

Answer 1

Cell cycle:

1. The cell cycle is the set of processes that occur within a cell that results in the duplication of DNA and the division of cytoplasm and organelles to form two daughter cells.
2. It is a four-stage process during which the cell grows (G₁ stage), replicates its DNA (S stage), prepares to divide (G₂ stage), and divides (M stage).

G₁ stage:

1. G₁ is an intermediary phase that occurs between the end of mitosis and the start of DNA replication during the S phase.
2. Because this is the moment when a cell develops, the G₁ phase is also known as the growth phase.
3. The cell synthesizes several enzymes and nutrients during this phase, which are subsequently required for DNA replication and cell division.
4. The duration of the G₁ phase varies and is frequently determined by the nutrients available to a cell.
5. Cells create the most proteins during the G₁ phase.