OCR F212 Biological Molecules: Enzymes

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·         Globular proteins with a specific tertiary structure which catalyses metabolic reactions in living organisms

·         Enzyme action may be intracellular or extracellular

·         The active site of an enzyme is a specific shape depending on the reaction it catalyses

·         Meaning other molecules won’t fit the active site

·         Active site is the area where the substrate binds

·         An enzyme reduces activation energy

·         A model is a visible representation of how something works


Effects: pH

·         Enzymes have an optimum pH value

·         Above OH- or below H+ ions disrupt ionic bonds and hydrogen bonds that hold the tertiary structure in place

·         Active site changes


·         RoR increases as temperature increases

·         More heat means more kinetic energy molecules move faster and so more likely to form ESC

·         Too high a temperature means the bonds vibrate too much and break the active site is lost…


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