An exothermic chemical process that transfers energy for life processes, using glucose as fuel.

The factor that we change in an experiment.

The factor that we measure in an experiment.

Causes results to differ by different amounts due to a factor other than the independent variable (the factor we changed).

Causes measurements to differ from the true value by the same amount each time they are taken.

The effect of different substrates on cellular respiration in yeast: practical

Combined science

Pupils will learn how substances essential for chemical reactions, and the products of the reactions, are transported into, around and out of plants, and about factors affecting the rate of water uptake by a plant.

Pupils learned about photosynthesis in producers, including a two-stage model of the process and the requirements and products of each stage.

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.

Aerobic and anaerobic cellular respiration

Physical activity and equipment requiring safe use

What name do scientist give to errors that cause measurements to differ from the true value by the same amount each time?

Yeast is used in the production of a variety of food and drinks. Which food or drink is made **without** yeast?

The equation for anaerobic respiration in yeast is not balanced. What coefficient (number) needs to be added before the formulae for ethanol and carbon dioxide, to balance the equation?

The active site of amylase will bind to both starch and cellulose.

The active site of amylase will bind to neither starch nor cellulose.

The active site of amylase will bind to starch and not cellulose.

The active site of amylase will not bind to starch but will to cellulose.

Starch and cellulose are both large molecules made of thousands of glucose molecules joined together. The enzyme amylase can break down starch but not cellulose. Why?

Volume of gas collected in the measuring cylinder

The apparatus is used to measure the rate of respiration in yeast, provided with different substrates. When using this apparatus, which of the listed variables is the independent variable?

To prevent random error, a meniscus must always be read the same way. Where on a meniscus are readings taken?

part of an enzyme to which a specific substrate can bind

a model used to explain the specificity of enzymes

Bonds in the enzyme break, changing the shape of the enzyme.

Bonds in the substrate break, changing the shape of the active site.

Bonds in the substrate break, changing the shape of the substrate.

Bonds in the enzyme break, changing the shape of the active site.

Which is the **best** explanation of the term denatured?

The boiled peas will have a slower rate of cellular respiration.

The boiled peas will have a faster rate of cellular respiration.

The boiled and germinating peas will respire at the same rate.

The boiled peas will not respire but the germinating peas will respire.

Some peas are boiled and then cooled back to room temperature. The peas are then used in a respirometer at 30°C. How will the respirometer results for the boiled peas compare to germinating peas?

In three 5 minute tests using a respirometer, the water in the capillary tube moves 10 mm, 12 mm and 8 mm. The mean rate of respiration for these results is {{}} mm/min.

The amount of oxygen needed for aerobic respiration.

The amount of oxygen needed for anaerobic respiration.

The amount of oxygen needed to remove lactic acid made by anaerobic respiration.

The amount of oxygen needed to remove CO$$_2$$ made by anaerobic respiration.

Aerobic cellular respiration transfers more energy per molecule of glucose.

Aerobic cellular respiration uses mitochondria.

Aerobic cellular respiration produces carbon dioxide.

For a working muscle cell, what is the major advantage of aerobic cellular respiration compared to anaerobic cellular respiration?

Content guidance

Risk assessment required - equipment

Adult supervision required

This lesson will be removed by end of Summer Term 2025.

The effect of different substrates on cellular respiration in yeast: practical

Lesson outcome

Content guidance

This lesson will be removed by end of Summer Term 2025.