Question

during the cell cycle, the cell must pass through several checkpoints that confirm that the cell is ready to progress to the next phase of the cycle. if the requirements of one phase have not been met, the cell cannot proceed to the next phase. these checkpoints help control the rate of cell division.
if a mutation disables one of these checkpoints, what is most likely to happen?
the cell cannot proceed to the next phase of the cycle and must remain in the current phase.
the cell begins dividing uncontrollably, forming a tumor.
cells proceed through phases of the cell cycle in the wrong order.
the cell stops dividing, entering the g0 (gap 0) phase.

Explanation:

Cell cycle checkpoints control cell division. If a checkpoint is disabled (mutated), the cell loses a regulatory mechanism. Tumors form from uncontrolled cell division. The first option is incorrect as the checkpoint is disabled (so no block). The third option is wrong as checkpoints don't control order (they control progression). The fourth option is incorrect as disabling a checkpoint doesn't lead to G0 (which is a resting state, not due to disabled checkpoints).

Answer:

The cell begins dividing uncontrollably, forming a tumor.