Pearson Edexcel AS Level · Biology B (8BI0)
3 multiple-choice questions marked as you go, and 3 written questions with worked solutions. All on Enzymes.
An experiment was conducted to investigate the effect of substrate concentration on the rate of an enzyme-controlled reaction. At very high substrate concentrations, the rate of reaction levels off and becomes constant. What is the most likely reason for this observation?
A non-competitive inhibitor is added to a reaction mixture containing an enzyme and its substrate. How will the addition of this inhibitor affect the maximum rate of reaction (\(V_{max}\)) and the affinity of the enzyme for its substrate?
In the study of enzyme kinetics, the induced fit hypothesis is often preferred over the lock and key model. Which statement best describes the induced fit hypothesis?
Explain why measuring the initial rate of an enzyme-controlled reaction is more accurate than measuring the average rate over the entire duration of the reaction.
Write your answer out first, then check it against the worked solution.
An enzyme-controlled reaction has an activation energy of \(E_a\). Explain, in terms of molecular collisions and energy levels, how the addition of a specific globular protein catalyst alters this value.
Write your answer out first, then check it against the worked solution.
Using the induced fit hypothesis, describe how the shape of an enzyme's active site changes when a substrate molecule binds to it.
Write your answer out first, then check it against the worked solution.
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