Chapter 2

Question 1

Cell division

Answer 1

Chromosomes are found in the nucleus of the cells. Chromosomes are made of DNA.

Question 2

Stages of the cell cycle (3)

Answer 2

• Stage 1: Interphase = DNA doubles
• Stage 2: Mitosis = Nucleus divides
• Stage 3: Cytokinesis = Cytoplasm and cell membrane divides to form two new cells

Question 3

Growth

Answer 3

• A permanent increase in size

- To repair and replace

Question 4

Stem cells are found in…

Answer 4

• Embryos (can make any human cell)
• Adult bone marrow (can make many types of cells eg blood cells)
• Meristem of plants (can make any plant cell)

Question 5

How can these stem cells cure diseases…

Answer 5

• Bone marrow stem cells are already used.
• Stem cells from unwanted embryos could be used to replace faulty cells in sick people.
• Therapeutic cloning could be used to make stem cells genetically identical to the patient (no rejection).

Question 6

A issue with the use of stem cells being uses to cure diseases

Answer 6

Ethical issues: embryos are potential human life, but is human suffering more important?