Cell cycle checkpoints

Which molecules act as gatekeepers for each checkpoint of the cell cycle?

• p53 gene

• cyclins

• thyroid hormones

What is the purpose the the cell cycle checkpoints?

• To repair damaged cells before they enter cell division.

• To remove damaged cells from an organism.

How many cell cycle checkpoints are there?

• 1

• 2

• 3

• 4

What is the first checkpoint of the cell cycle?

• Mitosis checkpoint

• G₁ checkpoint

• G₂ checkpoint

When is apoptosis initiated?

• When DNA damage is repaired.

• When cells are removed from the cell cycle.

• When DNA damage cannot be repaired.

This is the cell cycle checkpoint that makes sure environmental conditions are ideal for cell survival.

• G1 Checkpoint
• G2 Checkpoint
• M Checkpoint
• I Checkpoint

This is the cell cycle checkpoint that makes sure DNA has been replicated correctly during S phase.

• G1 Checkpoint
• G2 Checkpoint
• M Checkpoint
• I Checkpoint

This is the cell cycle checkpoint that makes sure the correct number of chromosomes are present and attached to spindle fibers

• G1 Checkpoint

• G2 Checkpoint

• M Checkpoint

• I Checkpoint

The checkpoints that regulate the cell cycle can fail when ____ becomes damaged.

• DNA 
• Cell Membrane
• Mitochondria
• Ribosomes

Tags

NGSS.HS-LS1-4

Name the 3 checkpoints of the cell cycle

• Anaphase checkpoint, mitosis/metaphase checkpoint, and telophase checkpoint

• Interphase checkpoint, S phase checkpoint, and M phase checkpoint

• G1 checkpoint, G2 checkpoint, and S phase checkpoint

• G1 checkpoint, G2 checkpoint, and mitosis/metaphase checkpoint

Tags

NGSS.HS-LS1-4