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ZIMSEC O-Level Biology

8.4.2Mode of enzyme action

Mode of enzyme action in ZIMSEC O-Level Biology: what the syllabus expects you to know, the learning objectives and how to practise.
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Overview

Form 3.

Learning objectives

What the syllabus expects you to be able to do.

  1. 8.4.2.1Explain how enzymes work using the lock-and-key hypothesis.
  2. 8.4.2.2Investigate and explain the effects of temperature and pH on enzyme activity.

Lessons

  • Effects of temperature and pH on enzymes

    26 min

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Sample question

A sample question on this topic. Answer it, check it, then read the worked answer.

Mode of enzyme action: sample question

1 mark

An enzyme from the human gut is kept at 5 °C for an hour and then warmed to 37 °C. What happens to its activity?

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