CAIE A Level Biology 9700 · Immunity

Immunity: explain question

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A new pathogen, Neocella, has caused an outbreak of a severe respiratory disease. Scientists are exploring two strategies to combat the infection:

  • Strategy A: Production of a monoclonal antibody that binds to a surface protein of Neocella. The antibody will be administered to infected patients.
  • Strategy B: Development of a vaccine containing inactivated Neocella particles. This will be given to healthy individuals as part of a national vaccination programme.

Using your knowledge of immunity, explain:

  • How the molecular structure of an antibody enables it to function in the detection and neutralisation of a pathogen such as Neocella.
  • The principles behind the hybridoma method used to produce monoclonal antibodies.
  • The type of immunity (active or passive; natural or artificial) conferred by each strategy, and why a vaccination programme can help control the spread of an infectious disease.
0 words · 6 marks

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6 marks, so the mark scheme is looking for about 6 separate creditworthy points. Making the same point twice in different words earns it once.

Explain means: Give the reasons or the mechanism: why or how something happens. Link each point to the next with because, so or which means. A list of facts with no links usually loses the reasoning marks.

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