CAIE A Level Biology 9700 · Immunity
A person is infected with a novel influenza virus strain. They recover and are later exposed to the same strain several years later.
Compare the primary and secondary immune responses to this pathogen, explaining the role of memory cells in the differences observed.
5 marks, so the mark scheme is looking for about 5 separate creditworthy points. Making the same point twice in different words earns it once.
Compare means: Give similarities or differences between two things, and say which side each point belongs to. Write each point as a pair, for example: A is X, whereas B is Y. Two separate descriptions rarely earn the marks.
Written by Markquill to follow the Cambridge International syllabus. Markquill is independent and is not affiliated with or endorsed by Cambridge International.