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A-Level Biology OCR A

Enzyme Specific Substrate Active Complex Product(s State Sequence

Enzyme-controlled reactions occur when a substrate binds to an enzyme's active site, forming products that are then released, regenerating the enzyme.

An enzyme-controlled reaction involves substrate binding to the enzyme's active site to form an enzyme-substrate complex, followed by product formation and release, leaving the enzyme unchanged.

Front State the sequence of events in an enzyme-controlled reaction.
Back Enzyme controlled reaction:
  • Molecules in solution move & collide randomly
  • When a specific substrate collides with a specific enzyme and it fits the active site, the substrate binds to the active site - enzyme-substrate complex
  • Substrate(s) react and product(s) are formed in an enzyme-product complex
  • Product(s) are released, leaving enzyme unchanged and able to catalyse more reactions

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