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:
- they can often survive outside a host for long periods of time [1 mark]
- they then infect a suitable host cell [1 mark]
- they replicate themselves thousands of times [1 mark]
- they copy their genetic material (DNA or RNA) and protein coats [1 mark]
- this often causes the host cell to burst [1 mark]
- 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:
- the leaves turn yellow or white [1 mark]
- they also become crinkled or curled [1 mark]
- this reduces photosynthesis in chloroplasts [1 mark]
- which means plants have less glucose for respiration [1 mark]
- 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:
- phagocytes surround any pathogens in your blood and engulf them [1 mark]
- enzymes inside the phagocytes then breakdown the pathogen [1 mark]
- lymphocytes recognise proteins on the surface of pathogens called antigens [1 mark]
- they then produce antibodies which make pathogens stick together [1 mark]
- 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:
- risk factors are things that increase a person鈥檚 chance of developing a disease [1 mark]
- they can be part of a person鈥檚 lifestyle [1 mark]
- they can be substances in a person鈥檚 body or their environment [1 mark]
- smoking is a risk factor for lung cancer [1 mark]
- tar in cigarettes is a carcinogen [1 mark]鈥