CAIE A Level Biology 9700 · Homeostasis
A patient consumes a diet very high in protein, resulting in an excess of amino acids that cannot be stored. Describe the process by which the liver handles these excess amino acids and forms urea, and include why this process is important for homeostasis in mammals.
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.
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