Multiple Choice
In which stage of the cell cycle is a cell immediately before mitosis (M phase) begins?
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16. Cell Division
G1 Phase
Multiple Choice
In the context of the cell cycle during and after G1, what best describes the G0 phase?
A
The phase in which chromosomes condense and the nuclear envelope breaks down
B
A quiescent state in which cells exit the cell cycle, remain metabolically active, and do not replicate DNA unless they re-enter the cycle
C
A checkpoint-controlled phase in which sister chromatids separate and cytokinesis is completed
D
The phase in which DNA replication occurs prior to mitosis
Verified step by step guidance1
Step 1: Understand the context of the cell cycle phases, especially focusing on what happens during and after the G1 phase.
Step 2: Recall that the G1 phase is a period of cell growth and preparation for DNA replication, which occurs in the subsequent S phase.
Step 3: Recognize that the G0 phase is a distinct state where cells exit the active cycle after G1 and do not proceed to DNA replication or division immediately.
Step 4: Note that cells in G0 are metabolically active but remain in a quiescent (non-dividing) state, meaning they do not replicate DNA unless they receive signals to re-enter the cycle.
Step 5: Differentiate G0 from other phases such as mitosis (where chromosomes condense and nuclear envelope breaks down) and S phase (where DNA replication occurs), confirming that G0 is best described as a resting or quiescent phase outside the active cycle.
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