Biology- B5

Question 1

A stem cell is an unspecialised cell that can become any type of cell in the right conditions

Answer 1

The two type of stem cells are adult and embryonic cells

Question 2

Adult stem cell

Answer 2

• Used to cure disease e.g. Sickle cell anaemia

- in bone marrow

Question 3

Embryonic stem cells

Answer 3

• can be extracted from human embryos which then could be made to differentitiate into specific cells to replace faulty cells
• can help treat things like leaukiemia

Question 4

Cloning can be used to make stem cells

Answer 4

• genetic material is removed from an egg cell
• a nucleus from a body cell of the adult your cloning is then instered in the egg cell
• under the right conditions, inactive genes in the nucleus of the body cell can be reactivated so that an embryo forms
• embryonic stem cells can then be extracted from the embryo, they can then be controlled to form any type of specialised cell

Question 5

Mitiosis

Answer 5

-occurs in all body cells
- has 1 division
- creates 2 daughter cells
Has 46 number of chromosomes
-produces body cells
- used for growth and repair