Go-phase:

The Go-phase is a stage in the cell cycle where the cells remain metabolically active but do not proliferate.

Explanation:

The cell cycle is a series of events that occur in a eukaryotic cell, leading to its division into two daughter cells. The cell cycle consists of several phases, including the G1-phase, S-phase, G2-phase, and M-phase. The G1-phase is the first phase of the cell cycle, where the cell increases in size, and the cytoplasmic organelles replicate. In the S-phase, DNA replication occurs, and the chromosomes duplicate. In the G2-phase, the cell undergoes a final growth phase before entering the M-phase, where the cell divides into two daughter cells.

However, not all cells undergo the complete cell cycle. Some cells enter a non-proliferative stage called the Go-phase. In this stage, the cells remain metabolically active, but they do not proliferate. This stage is also known as the quiescent stage, and cells can enter this stage due to several reasons, such as lack of nutrients, growth factors, or due to damage in the DNA. Cells in the Go-phase can re-enter the cell cycle if they receive the necessary signals to do so.

Conclusion:

In summary, the Go-phase is a stage in the cell cycle where the cells remain metabolically active but do not proliferate. Cells can enter the Go-phase due to several reasons, and they can re-enter the cell cycle if they receive the necessary signals to do so.