B1 2014

Question 1

How does he decay of plants create warmth?

Answer 1

Microorganisms respire and release energy.

Question 2

Explain why antibiotics cannot be used to treat measles.

Answer 2

Antibiotics don’t kill viruses because they live inside cells.

Question 3

How is information passes from the relay neurone to the motor neurone?

Answer 3

Release of chemical across synapse. Chemicals attach to motor neurone, causing an impulse.

Question 4

Harmful effect of thalidomide?

Answer 4

Limb abnormalities.

Question 5

Describe how scientists can transfer the gene from Bacillus thuringiensis to maize plants?

Answer 5

Gene cut out from chromosome using enzymes. Gene added at an early stage of development.

Question 6

Advantages of GM crops?

Answer 6

Pesticide doesn’t wash away. Less insects to eat crops and therefore a greater yield of crops.

Question 7

Disadvantages of GM crops?

Answer 7

Toxins kill other insects, so crops aren’t pollinated. Possible harm come to humans as side effects aren’t known.