BRAINCAKEEnzymes
Revision notes for Enzymes in Edexcel Biology B (8BI0). Every lesson in BrainCake comes with R.E.C.I.P.E. recall steps, a quick check and spaced reviews.
- EnzymesEnzymes are globular proteins that speed up the chemical reactions in living organisms.
- Extra-Cellular and Intracellular EnzymesEnzymes can be grouped by where they act.
- Biological CatalystsA catalyst is a substance that increases the rate of a chemical reaction without being used up.
- Lock and Key HypothesisThe lock and key hypothesis was proposed by Emil Fischer in 1894 to explain how enzymes work and why they are specific.
- Induced Fit HypothesisThe induced fit hypothesis was proposed by Daniel Koshland in 1958.
- Measuring Rate of ReactionThe rate of an enzyme-controlled reaction is the change in the amount of substrate or product per unit time.
- Effect of Substrate ConcentrationWhen enzyme concentration and all other conditions are kept constant, changing the substrate concentration gives a characteristic curve.
- Effect of TemperatureTemperature affects enzyme activity in two opposing ways.
- Effect of pHEach enzyme works fastest at a particular pH, its optimum pH.
- Effect of Enzyme ConcentrationIf the substrate concentration and all other conditions are kept constant, changing the enzyme concentration changes the number of active sites…
- Reversible and Irreversible InhibitionAn inhibitor is a substance that binds to an enzyme and reduces its activity.
- Competitive InhibitionA competitive inhibitor is a molecule with a similar shape to the substrate.
- Non-competitive InhibitionA non-competitive inhibitor does not bind to the active site.
- End-Product InhibitionEnd-product inhibition is a way that a cell controls a metabolic pathway: the final product of the pathway inhibits an enzyme that acts near the…
On the specification
- 1.5 Enzymes