Multiple Choice
At which stages of the cell cycle do the major regulatory checkpoints occur?
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11. Cell Division
Cell Cycle Regulation
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Which phase of the cell cycle is primarily responsible for the regulation of cell division?
A
G2 phase
B
G1 phase
C
S phase
D
M phase
Verified step by step guidance1
Understand the cell cycle: The cell cycle consists of several phases that a cell goes through to divide and produce new cells. These phases include G1, S, G2, and M phase.
Identify the role of each phase: G1 phase is where the cell grows and prepares for DNA replication. S phase is where DNA replication occurs. G2 phase is where the cell prepares for mitosis. M phase is where mitosis and cytokinesis occur, leading to cell division.
Focus on the regulation of cell division: The regulation of cell division is primarily controlled during the M phase, where the cell undergoes mitosis and cytokinesis to divide into two daughter cells.
Consider checkpoints: The cell cycle has checkpoints, particularly in the G1, G2, and M phases, that ensure the cell is ready to proceed to the next phase. The M phase checkpoint ensures that all chromosomes are properly aligned before the cell divides.
Conclude with the importance of M phase: The M phase is crucial for the regulation of cell division as it is the phase where the physical process of dividing the cell occurs, ensuring that each daughter cell receives the correct number of chromosomes.
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