The Cell Cycle Flashcards
1
Q
What is the cell cycle divided into?
A
Interphase
Mitosis
Cytokinesis
2
Q
Which stages are present in interphase?
A
G0
G1
Synthesis (S)
G2
3
Q
What happens in the G0 phase?
A
Cell is neither dividing nor preparing to divide
Cell remains in this stage until there is a reason to divide
4
Q
What happens in the G1 stage?
A
- Protein synthesis occurs —> cell growth
- Organelles x2
- DNA content: 23 pairs
- Checkpoint at this stage
- Cell can return back to G0 from this stage
5
Q
What happens in the S phase?
A
- DNA synthesis occurs —> replication
- DNA content: 46 pairs
6
Q
What happens in the G2 phase?
A
- Cytoskeleton breaks down and protein microtubules assemble into spindle fibres
- DNA content: 46 pairs
- Second checkpoint is present here
7
Q
What is mitosis?
A
- The part of the cell cycle in which a eukaryotic cell divides to produce 2 daughter cells
- Each with the identical copies of DNA produced by the parent cell during DNA replication
8
Q
What is cytokinesis?
A
Cell completely divides into 2 daughter cells
Cytoplasm and cell membrane separate
9
Q
How do you recognise interphase happening under a microscope?
A
No chromatids / chromosomes visible
10
Q
How do you calculate time spent in a phase?
A
(No of cells in phase ÷ total no of cells) x time for total cell cycle
