Cell Cycle

Question 1

What are the steps to the cell cycle?

Answer 1

1. G1
   - (G0)
2. G1/S phase
3. S phase
4. G2
5. G2/M checkpoint
6. M phase (mitosis)

Question 2

What are the purpose of cell cycle checkpoints?

Answer 2

Allow or prohibit the cells progression to the next stage

Question 3

What are the steps in interphase?

Answer 3

G1, S, G2

Question 4

What happens during G1?

Answer 4

• Cell grows
• proteins necessary for cell division are synthesized

Question 5

What happens during G1/S checkpoint?

Answer 5

Holds cells until has all enzymes and proteins necessary for replication of
DNA

AFTER: the cell is commited to divide

Question 6

What happens during S phase?

Answer 6

DNA SYNTHESIS (DNA is replicated)
• each chromo is duplicated

RESULTS: each chromosome is composed of two sister chromatids

Question 7

What happens during G2?

Answer 7

Biochemical preparation for cell division

Question 8

What happens in the G2/M checkpoint?

Answer 8

Assures that DNA is completely replicated and undamaged

*IF PASSED: cell is ready to divide and enter M Phase.

Question 9

What is the M phase?

Answer 9

Period of active cell division. Includes MITOSIS and cytokinesis

Question 10

What is cytokinesis?

Answer 10

Cytoplasmic division

Question 11

What happens in mitosis?

Answer 11

Sister chromatids separate in 5 steps.