Answer :

A cell is in the process of going through the cell cycle, and suddenly in runs out of tubulin. It is likely to stop at M checkpoint, also called spindle checkpoint.

Cell cycle is the sequential series of events that take place in the division of a cell. It starts with a long interphase during which it prepares for the cell division. Then comes the M-phase where the actual division takes place. The Interphase is subdivided into three sub-phases: G1, S and G2 phases. After division, the cell may or may not enter into a resting phase called G₀ phase. During this phase the cell does nothing, it just rests.

Checkpoints are the machinery that ensure that every preparation has been done before the cell enters a specific stage. It ensures that no mistake is done during the cell cycle. If any fault is suspected, the cell is stopped then and there to avoid any wrong step.

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