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GCSE Biology · key term
The region of an enzyme where a complementary substrate binds and the reaction is catalysed.
Used by AQA, Edexcel and OCR
Specification 4.2.2.1, 4.8 · Paper 1, Paper 2
The specifically shaped region of an enzyme to which a complementary substrate binds.
Revise: The Mechanism and Factors of Enzyme ActionPart of this shape forms an active site, where a reactant called the substrate can bind. Because active sites have different shapes, enzymes catalyse specific reactions.
The region of an enzyme to which its substrate binds.
Specification 1.7, 1.8, 1.9, 3.7B · Paper 1, Paper 2
The region of an enzyme where a substrate binds and the reaction is catalysed.
Revise: Mechanism of Enzyme ActionAn enzyme does not simply speed up every reaction around it. Its three-dimensional shape includes a specially shaped region called the active site, where the reacting substance binds. That reacting substance is the substrate.
The specifically shaped region of an enzyme where its substrate binds and the reaction is catalysed.
The region of an enzyme with a shape that is complementary to its substrate and where the reaction is catalysed.
The specifically shaped region of an enzyme to which its substrate binds.
Specification B1.2g, B5.1e · Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Higher), Paper 4 (Higher)
Revise: Enzyme Mechanism and MetabolismA small region of this structure is the active site, where the reaction takes place. The reactant acted upon by the enzyme is called its substrate.
The region of an enzyme with a shape complementary to its substrate, where the reaction is catalysed.
The part of an enzyme where its substrate binds.
Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Higher), Paper 4 (Higher)
The specifically shaped region of an enzyme to which its substrate binds and where the reaction is catalysed.
Revise: EnzymesA small region called the active site has a shape that is complementary to its substrate. In the lock-and-key model, the active site is represented by a lock and the correctly shaped substrate by its key.
The region of an enzyme to which a substrate with a complementary shape binds.
For high temperature or extreme pH, explain the whole chain: bonds are disrupted, the enzyme’s shape changes, the active site is no longer complementary, fewer enzyme–substrate complexes form, and the rate decreases.
For enzymes, distinguish the substrate from the active site: the substrate is the molecule acted on, whereas the active site is part of the enzyme.
When explaining specificity, link the substrate’s complementary shape to binding at the active site; do not merely state that an enzyme is specific.
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