CAIE A Level Biology 9700 · Control and coordination
A person tastes a piece of sweet fruit. Describe the sequence of events that occur from the binding of a sweet-tasting molecule to a chemoreceptor on a human taste bud cell to the generation of an action potential in the sensory neurone connected to that cell.
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.