CAIE A Level Biology 9700 · Energy and respiration
The balanced equation for the complete aerobic respiration of the fatty acid palmitic acid is:
Describe how this equation can be used to determine the respiratory quotient (RQ) of palmitic acid. Explain why the RQ value for a lipid, such as palmitic acid, is different from that of a carbohydrate, and state the significance of the RQ value in identifying the respiratory substrate used by an organism.
4 marks, so the mark scheme is looking for about 4 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.