D2.1 Cell and Nuclear Division

Question 1

Reasons why cells need to divide

Answer 1

• Repair
• Replace
• Growth

Question 2

Define Mother cell

Answer 2

Parent cell.

Question 3

Define Daughter cell

Answer 3

Mother cell divides to create two daughter cells.

Question 4

Explain Cytokinesis in animal cells.

Answer 4

• Network of actin and myosin proteins form a contractile ring that pinches the cell membrane together.
• This forms a cleavage furrow, which gradually deepens and eventually splits the cytoplasm to form daughter cells.
• Fluid structure of double membrane facilitates this process.

Question 5

Explain Cytokinesis in plant cells.

Answer 5

• Involves assembly of a cell plate, formed from the fusion of vesicles containing cell wall materials.
• Cell plate grows outwards until it reaches existing cell wall, which it fuses with, splitting the parent cell into two daughter cells.