AQA A-Level Biology Enzymes: Q&A Revision Guide – 100% Verified

AQA A-Level Biology – Enzymes
question and answer 1oo% verified

1. Activation Energy - ANSWER>The minimum energy required for successful collisions to
result in a reaction



2. Enzyme Function - ANSWER>Lowers the activation energy for a reaction to start, behaves
as a catalyst



3. Enzyme Structure - ANSWER>Globular proteins that have a functional region known as an
active site



4. Active Site - ANSWER>Functional region on an enzyme that is complimentary to
substrates



5. Complimentary - ANSWER>Of a similar shape to one another



6. Induced Fit Model - ANSWER>The way by which an enzyme alters the shape of its active
site to be exactly complimentary with a substrate to form an enzyme-substrate complex



7. Lock and Key Theory - ANSWER>Older theory suggesting that enzymes have a fixed
shape active site that is always complimentary to specific substrates, rather than having
an adjustable shaped active site



8. Factors affecting Enzyme Action - ANSWER>temperature, pH, concentration of
enzyme/substrate



9. How Temperature affects Enzyme Action - ANSWER>Low temperature has few ES
complexes. Medium temperature has an increase in ES complexes. Optimum