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Summary OCR A/AS-Level Biology 2.4.1 Enzymes £2.99   Add to cart

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Summary OCR A/AS-Level Biology 2.4.1 Enzymes

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Revision Summary of key knowledge from OCR A/AS-Level Biology 2.4.1 Enzymes.

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  • Chapter 2.4.1
  • June 26, 2023
  • 2
  • 2022/2023
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Enzymes
What are Enzymes?
 Biological catalysts – chemicals that speed up the rate of a reaction and remain
unchanged and reusable at the end of the reaction
 Lower the activation energy of chemical reactions by influencing bond stability
 Lower activation energy creates an unstable transition state in the substrate from which
the reaction proceeds steadily
 Lower activation energy allows metabolic reactions to occur at body temperature
 The number of reactions an enzyme can catalyse per second is known as the turn-over
rate
 Enzymes are globular proteins with hydrophobic R groups on the outside, making them
water-soluble
 They have a specific, 3D tertiary structure
 The active site of an enzyme is an indented area with a shape that is specific to the
complementary substrate molecule

Intracellular Enzymes Extracellular Enzymes
 Performs its function within the cell  Performs its function outside of the cell
that produces it that produces it

Metabolic Pathways
 A series of consecutive reactions that are each catalysed by a specific enzyme and result
in a specific product
 Various reactants and intermediates act as substrates for specific enzymes
 These reactants, intermediates and products are called metabolites
 In catabolic pathways, metabolites are broken down into smaller ones and release
energy
 In anabolic pathways, energy is used to synthesise larger metabolites from smaller one

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