Multiple Choice
Which enzymes are primarily responsible for controlling the progression of cells through the cell cycle checkpoints?
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11. Cell Division
Cell Cycle Regulation
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Which factors determine whether a cell enters the G0 phase?
A
Presence of spindle fibers
B
Availability of growth factors
C
Concentration of ATP
D
Number of mitochondria
Verified step by step guidance1
Understand the cell cycle: The cell cycle consists of several phases, including G1, S, G2, and M phases. The G0 phase is a resting state where the cell is not actively preparing to divide.
Identify the role of the G0 phase: Cells enter the G0 phase when they are not dividing or preparing to divide. This can be a temporary or permanent state depending on the cell type and external conditions.
Consider the role of growth factors: Growth factors are proteins that stimulate cell division and survival. The availability of growth factors is crucial for a cell to progress through the cell cycle.
Analyze the impact of growth factors on the cell cycle: If growth factors are not available, cells may enter the G0 phase as they lack the necessary signals to proceed with division.
Conclude the determining factor: The availability of growth factors is a key factor in determining whether a cell enters the G0 phase, as they provide the signals needed for cell cycle progression.
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