UNIT TWO: Mitosis

Question 1

Mitosis is the name given to..?

Answer 1

Cell Division

Question 2

Mitosis is essential for..?

Answer 2

Growth and Repair

Question 3

Explain the Stages of Mitosis

Answer 3

1. Chromosomes are present in the nucleus.
2. Chromosomes double and form identical chromatids. The nuclear membrane breaks down.
3. Chromatids line up at the equator of the cell. Spindle fibres form.
4. Spindle fibres pull apart chromatids to opposite sides of the cell
   5.New nuclei form and cell membrane splits and two identical daughter cells form.

Question 4

What are Spindle fibres made of?

Answer 4

Protein

Question 5

Mnemonic for the stages of Mitosis

Answer 5

Double DNA Don’t
Equator Eat
Pulled apart Peoples
Split cell Socks

Question 6

Where are Stem Cells Found?

Answer 6

In Animals

They are un-specialised cells (self renew)

Question 7

What types of stem cells are there?

Answer 7

Embryonic- found only in early embryos
Adult Tissue- Found throughout the body in bone marrow in adult and children.

Question 8

What is Adult Tissue Stem Cells used for?

Answer 8

Repair

Question 9

What are Embryonic Stem Cells used for?

Answer 9

Develops into any cell
Allows an embryo to grow into a fully formed baby

Question 10

Examples of Specialised Cells

Answer 10

Nerve cell- Sends electrical impulses, long body to send message faster.

Sperm Cell- Swims to fertilise egg, tail helps movement.

Red Blood cell- Carries oxygen around the body, biconcave shape= large surface area.