Three and four mark questions

Your exam will be marked against specific answers. If it is a process like genetic modification or making monoclonal antibodies, then it is important to remember the steps in the correct order.

You will not be marked down for putting a step in the incorrect order, but you might miss out on a mark for a correct answer in the wrong place.

These questions have been written by Bitesize consultants as suggestions to the types of questions that may appear in an exam paper.

Sample question 1

Question

Describe the life cycle of a virus. [4 marks]

Four from the following:

  1. they can often survive outside a host for long periods of time [1 mark]
  2. they then infect a suitable host cell [1 mark]
  3. they replicate themselves thousands of times [1 mark]
  4. they copy their genetic material (DNA or RNA) and protein coats [1 mark]
  5. this often causes the host cell to burst [1 mark]
  6. other cells can then be infected [1 mark]

Sample question 2

Question

The tobacco mosaic virus infects tobacco plants and causes leaves to discolour. Explain the effects of this on the plant. [4 marks]

Four from the following:

  1. the leaves turn yellow or white [1 mark]
  2. they also become crinkled or curled [1 mark]
  3. this reduces photosynthesis in chloroplasts [1 mark]
  4. which means plants have less glucose for respiration [1 mark]
  5. so do not grow as well [1 mark]

Sample question 3

Question

Describe the difference between phagocytes and lymphocytes. [4 marks]

Four from the following:

  1. phagocytes surround any pathogens in your blood and engulf them [1 mark]
  2. enzymes inside the phagocytes then breakdown the pathogen [1 mark]
  3. lymphocytes recognise proteins on the surface of pathogens called antigens [1 mark]
  4. they then produce antibodies which make pathogens stick together [1 mark]
  5. lymphocytes also produce antitoxins to neutralise the effects of toxins produced by pathogens [1 mark]

Sample question 4

Question

Cancer is a non-communicable disease. Explain how smoking can affect the development of cancer. Define risk factors in your answer. [4 marks]

Four from the following:

  1. risk factors are things that increase a person’s chance of developing a disease [1 mark]
  2. they can be part of a person’s lifestyle [1 mark]
  3. they can be substances in a person’s body or their environment [1 mark]
  4. smoking is a risk factor for lung cancer [1 mark]
  5. tar in cigarettes is a carcinogen [1 mark]