AP Biologymediummcq1 pt

A researcher discovers a new compound that inhibits the G1/S checkpoint in the cell cycle. Based on this information, which of the following would be a likely effect on the cell?

A.C) The cell would undergo programmed cell death, or apoptosis.

B.B) The cell would arrest in the G2 phase, preventing entry into mitosis.

C.A) The cell would enter mitosis early, resulting in a shortened cell cycle.

D.D) The cell would continue to proliferate normally, unaffected by the compound.

Explanation

Core Concept

Inhibiting the G1/S checkpoint allows the cell to bypass DNA replication and enter mitosis without proper preparation. This could lead to errors in DNA replication and result in a shortened cell cycle. (Concept: Cell Cycle Regulation) The primary reason this is true is that the G1/S checkpoint is responsible for ensuring that the cell has completed DNA replication before entering mitosis.

Correct Answer

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