Year 11 - Science
The effect of different substrates on cellular respiration in yeast: practical
Aerobic and anaerobic cellular respiration
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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 covers cellular respiration as an exothermic reaction in all cells, comparing aerobic and anaerobic processes. It explores cell structures and functions, enhanced by electron microscopy. Emphasis is on conducting experiments, analysing data, and interpreting results.
Lesson Summary
You will learn to investigate the effect of different substrates on cellular respiration in yeast by using a measuring cylinder to collect the gas produced.
Key Notes
- Living yeast cells immobilised in alginate beads will carry out cellular respiration and produce carbon dioxide gas.
- The gas can be collected and the volume of gas measured using an upturned measuring cylinder under water.
- Identifying independent and dependent variables, and variables to control to increase the validity of the results.
- How to read the volume of gas from the meniscus in the measuring cylinder after a set time.
- Collecting repeat measurements for each substrate, and collecting data for different substrates.
Vocabulary To Learn
- cellular respiration: An exothermic chemical process that transfers energy for life processes, using glucose as fuel.
- independent variable: The factor that we change in an experiment.
- dependent variable: The factor that we measure in an experiment.
- random error: Causes results to differ by different amounts due to a factor other than the independent variable (the factor we changed).
- systematic error: Causes measurements to differ from the true value by the same amount each time they are taken.
Common Mistakes To Avoid
- Pupils often read the volume of gas incorrectly as they do not measure it from the bottom of the meniscus of the water in the measuring cylinder.
3 Quick Questions (With Answers)
1. Explain the scientific idea in this lesson using two key points.
Living yeast cells immobilised in alginate beads will carry out cellular respiration and produce carbon dioxide gas. The gas can be collected and the volume of gas measured using an upturned measuring cylinder under water.
2. Define this scientific word and use it in context. 'cellular respiration'
An exothermic chemical process that transfers energy for life processes, using glucose as fuel. Include the word in a full scientific explanation, not as a single label.
3. Correct this common scientific misunderstanding.
Mistake: Pupils often read the volume of gas incorrectly as they do not measure it from the bottom of the meniscus of the water in the measuring cylinder. Correction: This lesson contains a detailed explanation of how to correctly measure volumes from the meniscus, and why this is important.
More Lessons In This Unit
- Aerobic cellular respiration in humans and other organisms Study Guide
- Aerobic cellular respiration in humans and other organisms, including ATP Study Guide
- Anaerobic cellular respiration in humans and other organisms Study Guide
- Anaerobic cellular respiration in humans and other organisms, including ATP Study Guide
- Explaining the effect of different substrates on the rate of cellular respiration Study Guide
- Explaining the effect of temperature on the rate of cellular respiration Study Guide
- The effect of temperature on cellular respiration in small organisms: practical Study Guide
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