AP Biologyeasymcq1 pt
The G₁ checkpoint primarily verifies
A.cell size, nutrients, and DNA integrity before commitment
B.that sister chromatids are attached to spindles
C.that replication finished without errors
D.the cell's membrane potential
Explanation
Core Concept
The G1/S checkpoint integrates information about cell size, nutrients, growth signals, and DNA damage before the cell commits resources to DNA replication. If conditions are unfavorable, progression can be delayed or arrested; depending on cell type and signals, the cell may enter quiescence or activate other responses. The checkpoint should not be described as always forcing one specific fate.
Correct Answer
Acell size, nutrients, and DNA integrity before commitment
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