CAIE A Level Biology 9700 · Immunity
A patient is infected with a bacterial pathogen. Outline the sequence of events that occur when a macrophage encounters and responds to this pathogen, including the destruction of the bacterium and how the macrophage interacts with other immune cells.
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.
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.
Written by Markquill to follow the Cambridge International syllabus. Markquill is independent and is not affiliated with or endorsed by Cambridge International.