A-LevelBiologyEnzymes9700/12 · Oct/Nov 2020 · Q141 Mark
The painkiller ibuprofen reduces the activity of an enzyme involved in the production of prostaglandin. Ibuprofen binds reversibly to the active site of the enzyme. Which type of enzyme inhibition describes this example and why?
Acompetitive inhibition because ibuprofen alters the shape of the enzyme
Bcompetitive inhibition because ibuprofen and the substrate cannot bind at the same time
Cnon-competitive inhibition because ibuprofen blocks the active site
Dnon-competitive inhibition because ibuprofen has the same shape as the substrate
✓ Correct answer
B: competitive inhibition because ibuprofen and the substrate cannot bind at the same time
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