O-LevelBiologyEnzymes5090/11 · Oct/Nov 2018 · Q41 Mark
Enzyme action can be explained by the lock and key hypothesis. Where is the active site and does the substrate act as the lock or as the key?
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Aactive site on enzyme ✓, active site on substrate X, substrate acts as a lock ✓, substrate acts as a key X
Bactive site on enzyme ✓, active site on substrate X, substrate acts as a lock X, substrate acts as a key ✓
Cactive site on enzyme X, active site on substrate ✓, substrate acts as a lock ✓, substrate acts as a key X
Dactive site on enzyme X, active site on substrate ✓, substrate acts as a lock X, substrate acts as a key ✓
✓ Correct answer
B: active site on enzyme ✓, active site on substrate X, substrate acts as a lock X, substrate acts as a key ✓
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