CAIE A Level Biology 9700 · Infectious diseases
A patient visits a doctor with symptoms of a viral respiratory infection. The doctor prescribes a course of penicillin, stating it will 'clear up the infection'. Describe how penicillin acts on bacteria, explain why penicillin is ineffective against viruses, and discuss the consequences of antibiotic resistance as well as the steps that can be taken to reduce its impact.
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.
Describe means: Say what happens or what something is like, in order and with detail. You are not being asked why. If there is data, quote it: name the trend, then give figures with units at the points where it changes.
Written by Markquill to follow the Cambridge International syllabus. Markquill is independent and is not affiliated with or endorsed by Cambridge International.