CAIE A Level Biology 9700 · Enzymes
A student examines two enzymes: amylase, which is secreted by salivary glands into the mouth, and catalase, which is found inside liver cells.
(a) Outline the mode of action of enzymes, including the role of the active site, the formation of an enzyme-substrate complex, lowering of activation energy, and specificity.
(b) With reference to the locations of amylase and catalase, outline how the intracellular or extracellular location of an enzyme relates to its function.
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.
Written by Markquill to follow the Cambridge International syllabus. Markquill is independent and is not affiliated with or endorsed by Cambridge International.