When cells exit either semi-permanently or permanently from the cell cycle and develop a specific function, they are said to be in _____ phase.

• A. G0
• B. G1
• C. G2
• D. G3
• E. S

Answer: (A)

Verified step by step guidance

1. Understand the cell cycle: The cell cycle consists of several phases, including G1, S, G2, and M phases, which are involved in cell growth and division.
2. Identify the phase where cells exit the cycle: Cells that exit the cell cycle and do not actively prepare to divide are in a phase outside the typical cycle.
3. Learn about the G0 phase: The G0 phase is a resting state where cells have left the cycle and are not actively dividing. This can be a temporary or permanent state depending on the cell type.
4. Differentiate between G0 and other phases: Unlike G1, S, G2, and M phases, which are part of the active cell cycle, G0 is a non-dividing state.
5. Apply this knowledge to the problem: Recognize that when cells exit the cell cycle to develop a specific function, they are in the G0 phase.