B2 Cell Division And Stem Cells

Question 1

Interphase

Answer 1

cell grows in size, DNA and organelles replicate.

Question 2

Mitosis

Answer 2

Nucleus divides

replicated chromosomes line up along the centre of the cell and get pulled to
opposite poles.

Question 3

Cytokinesis

Answer 3

cell membrane and cytoplasm divide to form 2 new identical daughter cells.

Question 4

Stem cells

Answer 4

Unspecialised cells

Question 5

Embryonic stem cells

Answer 5

unspecialised cells from embryos

Question 6

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

Disadvantages of Embryonic stem cells

Answer 7

Unethical – embryos cannot give permission.

Possible harm/death to embryo.

Question 8

Adult stem cells

Answer 8

unspecialised cells from
adult tissues

e.g. bone marrow

Question 9

Advantages of Adult stem cells

Answer 9

Plentiful supply
No ethical issues as permission can be given
Well tried/tested

Question 10

Disadvantages of Adult stem cells

Answer 10

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