GCE O-Level · Biology (6093)

Enzymes: Practice Questions

5 multiple-choice questions marked as you go, and 1 written questions with worked solutions. All on Enzymes.

6 questions7 marksFree, no account

Question 1

1 mark

According to the 'lock and key' hypothesis, why is an enzyme able to catalyze only one specific type of chemical reaction?

Question 2

1 mark

A solution containing an enzyme and its substrate was initially incubated at \(5\,^{\circ}\text{C}\). The temperature of the reaction mixture was then gradually raised to \(37\,^{\circ}\text{C}\).

Which statement correctly explains why the rate of reaction increased?

Question 3

1 mark

The diagram shows an energy profile diagram for a chemical reaction occurring with and without an enzyme.

Which labelled arrow represents the activation energy of the enzyme-catalysed reaction?

Question 4

1 mark

Which chemical elements are present in all enzyme molecules?

Question 5

1 mark

The diagram below shows the 'lock and key' model of enzyme action.

Which letter represents the enzyme-substrate complex?

Question 6

2 marks

State the meaning of enzyme specificity and explain how it relates to the shape of an enzyme's active site.

Write your answer out first, then check it against the worked solution.

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