4B Eukaryotic Cell Cycle

Question 1

3 stages of Eukaryotic cell replication:

Answer 1

1. Interphase (cell growth)
2. Mitosis (nucleus division)
3. Cytokinesis (cytoplasm division)

Question 2

Stages of Interphase and one thing that happens in each stage:

Answer 2

G1 - organelles divide and increase in cytosol
Synthesis - DNA replicates
G2 - cell grows exponentially, preparing for mitosis
G0 - resting stage

Question 3

First stage of Mitosis

Answer 3

Prophase - spindle fibres form, chromatin condenses and nuclear membrane disappears.

Question 4

Second stage of Mitosis

Answer 4

Metaphase - Due to spindle fibres attaching to the centromere, chromosomes line up the equator of the cell

Question 5

Third stage of Mitosis

Answer 5

Anaphase – Spindle fibres contract, pulling sister chromatids away.

Question 6

Final stage of Mitosis

Answer 6

Telophase – chromosomes decondense, nuclear membrane forms, producing 2 genetically identical nuclei,

Question 7

Cytokinesis in animals

Answer 7

cleavage pinches plasma membrane into 2 cells

Question 8

Cytokinesis in plants

Answer 8

cell plate forms in between 2 cells, eventually turning into cell wall.

Question 9

Where are the checkpoints?

Answer 9

G1 – cell is the right size and any DNA damage.
G2 – DNA has replicated properly.
Metaphase – chromosomes lined up correctly.

Question 10

If something goes wrong in the checkpoints, what happens?

Answer 10

Apoptosis or cell enters G0.