B2 Cell Division

Question 1

Why does cell division happen

Answer 1

1. Replace damaged cell
2. To allow us to grow
3. Repair damaged cell
4. To produce sex cell (spem, egg cell)

Question 2

What is the cell cycle

Answer 2

The cell cycle is the way the body makes more cells this happens in 3 stages

Question 3

cell cycle stage 1

Answer 3

This is known as Interphase. In this stage the cell prepares itself to divide.The DNA is replicated ( doubled) and the organices (mitochondria and ribosomes make copies of them self’s the cell grows in size)

Question 4

cell cycle stage 2

Answer 4

This is known as Mitosis. replicated chromosomes line up along the centre of the cell and get pulled to
opposite poles. Nucleus divides.

Question 4

cell cycle stage 3

Answer 4

This is known as Cytokinesis: cell membrane and cytoplasm divide to form 2 new identical daughter cells.

Question 5

What is a stem cell

Answer 5

An unspecialised cell, that can differentiate into many other cell types.

Question 6

What are the advantages of Embryonic stem cells

Answer 6

Has the potential to develop into any type of cell/tissue.
Used to treat human diseases.
Painless

Question 7

What are the advantages of Adult stem cells

Answer 7

Plentiful supply.
No ethical issues (in collection) as permission can be given.
Well tried/tested.

Question 8

What are the disadvantages of Embryonic stem cells

Answer 8

Unethical – embryos cannot give permission. Possible harm/death to embryo.

Question 9

What are the disadvantages of Adult stem cells

Answer 9

Painful to extract .
Fewer diseases can be treated.
Can only form the type of cells as the
tissue they were taken from.