CAIE A Level Biology 9700 · Immunity

Immunity: outline question

Outline7 marksChallenge

A patient is bitten by a venomous snake and is immediately given an injection of antivenom, which contains antibodies that neutralise the venom. Several months later, the same patient receives a vaccine against tetanus.

(a) Outline the differences between the types of immunity provided by the antivenom injection and the tetanus vaccine. In your answer, you should compare active and passive immunity, and natural and artificial immunity.

(b) Using the example of snake venom, outline how monoclonal antibodies could be produced by the hybridoma method to treat venom poisoning. Relate the structure of antibodies to their function in neutralising toxins.

(c) Outline one way monoclonal antibodies can be used in diagnosis.

0 words · 7 marks

No account needed for your first marks. Your answer is used only to mark it.

How this question is marked

7 marks, so the mark scheme is looking for about 7 separate creditworthy points. Making the same point twice in different words earns it once.

Outline means: Give the main points briefly. Less detail than describe, but every key step has to be there. One short line per step, in order. The marks are for coverage, not depth.

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