Biology B2

Question 1

Stages of cell division

Answer 1

Interphase, Mitosis and cytokinesis

Question 2

Interphase

Answer 2

The cell is preparing to divide
The chromosomes are replicated and the cell gets bigger
The organelles are replicated

Question 3

Mitosis

Answer 3

The chromosone s line up along the centre of the cell
They attach to spindle fibres
The spindle fibres then contract and the chromosomes get pulled to opposite ends of the cell
The nucleus divides

Question 4

Cytokinesis

Answer 4

The cytoplasm and membrane divide

2 new genetically identical daughter cells are formed

Question 5

Embryonic stem cells

Answer 5

Embryonic stem cells are found in embryos and can differentiate into almost every cell type

Question 6

Adult stem cells

Answer 6

Adult stem cells are found in adult tissues (such as bone marrow brain ,muscle ,liver ,stem cells). They can differentiate only into cells from the type of tissue where they are found.

Question 7

Stem cell

Answer 7

A stem cell can replicate many times and has the potential to become specialised

Question 8

Process of therapeutic cloning

Answer 8

Nucleus taken out of human egg cell
Nucleus from a patients cell put into the egg cell
Egg cell stimulated to divide to develop into an embryo
Stem cells taken from the embryo after 4 to 5 days
Stem cells grown in a container of warm nutrients
Stem cells treated to develop into required cell types for a patient