CAIE A Level Biology 9700 · Enzymes
Lipase X is an enzyme produced by pancreatic cells and released into the small intestine, where it catalyses the breakdown of lipids into fatty acids and glycerol.
(a) Outline whether lipase X is an intracellular or extracellular enzyme, and explain how its location relates to its function.
(b) Outline how enzymes lower activation energy and describe the induced-fit model of enzyme action.
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.
Outline means: Give the main points briefly. Less detail than describe, but every key step has to be there. One short line per step, in order. The marks are for coverage, not depth.
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