CAIE A Level Biology 9700 · Genetic technology
Haemophilia A is treated with factor VIII. Historically, factor VIII was extracted from donated human blood plasma. Today, recombinant human factor VIII produced by genetically engineered cells is widely used. Outline the advantages of using recombinant human factor VIII compared with plasma-derived factor VIII for the treatment of haemophilia A.
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.
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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