Final answer:
The Go phase is a quiescent state in the cell cycle that some cells, like mature cardiac muscle and nerve cells, enter permanently, while others may do so temporarily.
Step-by-step explanation:
Cells that enter the Go phase are typically not preparing to divide and are considered to be in a quiescent state. Examples of cells that enter this phase permanently include mature cardiac muscle and nerve cells, which rarely divide, if at all. Conversely, some cells may enter the Go phase temporarily due to environmental conditions affecting nutrient availability or the presence of growth factors, and they will remain in this stage until conditions improve or an external signal stimulates their re-entry into the G1 phase.
Cells that enter the Go phase are not actively preparing to divide. This phase occurs when cells exit the cell cycle and can be temporary or permanent depending on the cell type. Some cells enter Go temporarily due to environmental conditions, while others, like mature cardiac muscle and nerve cells, remain in Go permanently.