Year 10 - Science
Effects of substrate concentration and temperature on rate of enzyme activity
Biological molecules and enzymes
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This pupil-friendly study guide includes a unit summary, clear notes, common mistakes, and quick questions with answers.
Unit Summary
This unit explores the roles of sugars, amino acids, and fatty acids in the synthesis and breakdown of biological molecules. It covers enzyme action, transport in organisms, hypothesis development, and data interpretation. Emphasis is on planning experiments and presenting explanations.
Lesson Summary
You will learn to explain how the rate of an enzyme reaction is affected by substrate concentration and temperature.
Key Notes
- The rate of a reaction is the amount of change (e.g. substrate broken down or product made) per unit of time.
- Enzyme reaction rate increases as substrate concentration increases, until an optimum when all active sites are full.
- Enzyme reaction rate increases with temperature due to more collisions, until an optimum when all active sites are full.
- Enzyme reaction rate decreases as temperature increases above the optimum, as the active site becomes denatured.
- Interpretation of graphs showing effects of substrate concentration and temperature on enzyme reaction rate.
Vocabulary To Learn
- rate of reaction: A measure of the amount of change that occurs per unit of time.
- concentration: A measure of the quantity of a dissolved substance in a given volume of solution.
- optimum: The conditions under which the maximum rate of reaction occurs.
- denatured: A permanent change in the shape of an enzyme that stops it from working properly.
Common Mistakes To Avoid
- Enzymes die rather than denature.
3 Quick Questions (With Answers)
1. Explain the scientific idea in this lesson using two key points.
The rate of a reaction is the amount of change (e.g. substrate broken down or product made) per unit of time. Enzyme reaction rate increases as substrate concentration increases, until an optimum when all active sites are full.
2. Define this scientific word and use it in context. 'rate of reaction'
A measure of the amount of change that occurs per unit of time. Include the word in a full scientific explanation, not as a single label.
3. Correct this common scientific misunderstanding.
Mistake: Enzymes die rather than denature. Correction: The word denature is clearly introduced and a CfU explores the word die vs denature.
More Lessons In This Unit
- Biological molecules Study Guide
- Enzymes: function, structure and specificity Study Guide
- Explaining effects of substrate concentration and temperature on enzyme rate Study Guide
- Obtaining the elements needed to make biological molecules Study Guide
- Tests for biological molecules Study Guide
- The effect of pH on the rate of an enzyme reaction: data analysis Study Guide
- The effect of pH on the rate of an enzyme reaction: plan Study Guide
- The effect of pH on the rate of an enzyme reaction: practical Study Guide
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