CAIE A Level Biology 9700 · Control and coordination
Compare the roles of calcium ions in the following two processes:
(i) The transmission of a signal from a taste bud chemoreceptor to a sensory neurone, following detection of a sweet taste.
(ii) The stimulation of contraction in striated muscle at a neuromuscular junction.
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.