A Level Biology - Enzymes 2.4

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Last updated: December 14, 2017
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First submittedDecember 14, 2017
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Definition
Keyword
Indented area on the surface of an enzyme molecule, with a shape that is complementary to the shape of the substrate molecule
Active site
Chemical that speeds up the rate of reaction and remains uncharged and reusable at the end of the reaction
Catalyst
Outside the cell
Extracellular
Inside the cell
Intracellular
The chemical reactions that take place inside living cells and organisms
Metabolism
Molecule produced from substrate molecules, by an enzyme-catalysed reaction
Product
Molecule that is altered by an enzyme-catalysed reaction
Substrate
A substrate that has to be present to ensure that an enzyme-catalysed reaction takes place at the appropriate rate
Cofactor
Definition
Keyword
Complex formed by temporary binding of enzyme and substrate molecules during an enzyme-catalysed reaction
Enzyme-substrate complex
Enzyme molecule with product molecule(s) in its active site
Enzyme-product complex
Temperature coefficient
Q10
Number of molecules per unit volume
Concentration
Where the inhibitor molecule has a similar shape to that of the substrate molecule and completes with the substrate for the enzyme's active site. It blocks the active site and prevents formation of enzyme-substrate complexes.
Competitive inhibition
A substance that reduces or stops a reaction
Inhibitor
Where the competitor molecule attaches to a part of the enzyme but not the active site. This changes the shape of the active site, which prevents ES complexes forming, as the enzyme active site is no longer complementary in shape to the substrate molecule
Non-competitive inhibition
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