Question

the cell cycle
the cell cycle = _interphase_ → _mitosis_ → _cytokinesis_.
controlled by protein _checkpoints_.
three main checkpoints:

• g1 checkpoint (restriction) → decide to divide, rest, or die.
• g2 checkpoint → checks for proper _.
• m (spindle) checkpoint → checks chromosome alignment in _.

cells divide only a limited number of times due to _ (chromosome \clocks\).
interphase & cell division
interphase phases:

• g1 = cell _.
• s = _ replication.

Explanation:

The G2 checkpoint checks for proper DNA replication and cell - size to ensure the cell is ready for mitosis. The M (spindle) checkpoint checks chromosome alignment in metaphase. Cells divide a limited number of times due to telomeres. In interphase, G1 is for cell growth and S is for DNA replication.

Answer:

• G2 checkpoint: DNA replication and cell - size
• M (spindle) checkpoint: metaphase
• Cells divide limit: telomeres
• G1: growth
• S: DNA