B2 - cell division exam questions

Question 1

name the structures inside a nucleus that contain DNA (1 mark)

Answer 1

chromosome

Question 2

what type of substance does a gene code for (1 mark)

Answer 2

protein

Question 3

most human body cells contain 6 × 10^–12 grams of DNA. what mass of DNA will a human sperm cell contain (1 mark)

6 × 10^–6 grams
6 × 10^–12 grams
3 × 10^–6 grams
3 × 10^–12 grams

Answer 3

3 × 10^–12 grams

Question 4

which process makes 2 genetically identical new body cells for growth and repair (1 mark)

Answer 4

mitosis

Question 5

name the chemical which genetic material is made from (1 mark)

Answer 5

DNA

Question 6

what is one section of genetic material on a chromosome called (1 mark)

Answer 6

a gene

Question 7

where are chromosomes found (1 mark)

Answer 7

in the nucleus of a cell

Question 8

what is the name of a section of a chromosome that controls a characteristic (1 mark)

Answer 8

gene

Question 9

during mitosis, cells need extra energy. which cell structures provide most of this energy (1 mark)

Answer 9

mitochondria

Question 10

why is mitosis important in living organisms (1 mark)

Answer 10

to repair tissues

Question 11

give 2 advantages of using stem cells (2 marks)

Answer 11

any two from
- can grow into any type of tissue
- used in medical research
- used to treat human diseases
- large numbers can be grown

Question 12

give 2 disadvantages of using stem cells (2 marks)

Answer 12

any two from
- expensive
- grow out of control/reference to cancers
- may be rejected
- need for drugs (for the rest of your life)