AP BIOLOGY

Detailed explanation-1: -G0 phase also known as the extended G1 phase which is a period during which the cell exits from the cell cycle. The cell exists in a quiescent state at this stage and does not divide.

Detailed explanation-2: -Some examples of cells that enter G0 and stay forever are nerve cells and heart cells. This is because once they reach maturity, nerve and heart cells do not divide again, so they stay in the G0 phase.

Detailed explanation-3: -Cells enter the G0 (inactive) phase after they exit the cell cycle when they are not actively preparing to divide; some cells remain in G0 phase permanently.

Detailed explanation-4: -The G0 phase is a form of the resting state, or quiescence, in which cells reside until they receive appropriate signals-for example, from growth factors-stimulating them to re-enter and progress through the cell cycle.

Detailed explanation-5: -In the G0 phase, there is no cell division. It is the resting phase of the cell cycle. Cells in the G0 phase exit the cell cycle and re-enter after receiving signals.