A-LevelBiologyEnzymes9700/12 · Feb/Mar 2019 · Q161 Mark

The diagram represents the reversible interaction between the active site of an enzyme and different inhibitors, X and Y. [Figure shows an enzyme with an active site, inhibitor X binding to active site, inhibitor Y binding to an allosteric site and changing active site shape] Which row correctly identifies the type of inhibition shown by inhibitor X and inhibitor Y?

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AX: competitive, Y: competitive

BX: competitive, Y: non-competitive

CX: non-competitive, Y: competitive

DX: non-competitive, Y: non-competitive

✓ Correct answer

B: X: competitive, Y: non-competitive

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