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Module 2: Foundations in biology
Quick questions on Enzymes: induced fit, activation energy, rate factors and inhibition - OCR A-Level Biology A
5short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.
What are enzymes as catalysts?Show answer
Enzymes are globular proteins that act as biological catalysts: they speed up metabolic reactions by lowering the activation energy without being used up. The substrate binds to the enzyme's active site to form an enzyme-substrate complex; the products are then released and the enzyme is free to catalyse again.
What is the two models of enzyme action?Show answer
Enzymes are specific because the tertiary structure of the active site is complementary to one substrate (or a small group of similar substrates).
What is q1?Show answer
Explain why an enzyme is specific to its substrate. [2 marks]
What is q2?Show answer
Describe how a decrease in pH below the optimum reduces the rate of an enzyme reaction. [2 marks]
What is q3?Show answer
State the difference between a coenzyme and a prosthetic group. [2 marks]
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