Cell Division

Question 1

What stages are in the cell cycle?

Answer 1

• Interphase

- M phase

Question 2

What stages are in the stage interphase?

Answer 2

• Gap phase 1 (G1)
• Gap phase 2 (G2)
• Synthesis

Question 3

What stages are in M phase?

Answer 3

• Mitosis

- Cytokinesis

Question 4

How is the cell cycle regulated?

Answer 4

With checkpoints at key points during the cycle

Question 5

What are the 2 main checkpoints?

Answer 5

• G1/S checkpoint (restriction point)

- G2/M checkpoint

Question 6

What is the purpose of checkpoints?

Answer 6

• Prevent uncontrolled cell division that would lead to tumours
• Detect and repair damaged DNA

Question 7

What does the molecular events that control the cell cycle happening in a specific order ensure?

Answer 7

• That the cell cycle cannot be reversed

- That the DNA is only duplicated once during each cell cycle

Question 8

What happens during M phase?

Answer 8

• Cell growth stops
• Nuclear division (mitosis)
• Cytokinesis