Cell Cycle

Question 1

State three events that occur in G1 phase of the cell cycle

Answer 1

Cells grow and increase in size; proteins from which organelles are made are synthesised (transcribed and translated); organelles replicate

Question 2

What happens during the S phase of the cell cycle?

Answer 2

This is the synthesis phase, DNA is replicated.

Question 3

What happens during the G2 phase?

Answer 3

Second growth phase, proteins which involved in making the chromosomes condense are synthesised (transcribed and translated).

Question 4

Describe what may happen in G0 phase of the cell cycle

Answer 4

Cells may undergo apoptosis, differentiation or senescence.

Question 5

State three cell cycle checkpoints and briefly describe what is being checked for at each

Answer 5

G1/S - checks for size, growth factors, nutrients, DNA damage; G2/M - checks DNA has been properly replicated; spindle assembly - checks chromosomes have correctly attached to spindle fibres.