GCSE AQA Biology Organisation: Digestion: Catalase is an enzyme.

Catalase

Question

Catalase is an enzyme.

Catalase controls the following reaction:

hydrogen peroxide → water + oxygen

A student did an investigation on catalase activity.

This is the method used.

1. Put 1 cm³ hydrogen peroxide solution in a test tube.
2. Add 1 cm³ of catalase solution.
3. Bubbles of oxygen are produced.
4. Bubbles cause foam to rise up the tube.
5. Measure the maximum height of the foam.

Figure 4 shows the experiment.

The experiment is carried out at 20 °C.

Table 1 shows some results from the investigation.

| Temperature in °C | Maximum height of foam in cm |
|--------------------|------------------------------|
| 10                 | 1.3                          |
| 20                 | 0.0                          |
| 30                 | 5.2                          |
| 40                 | 4.2                          |
| 50                 | 2.1                          |
| 60                 | 0.0                          |

The student thought one result was an anomaly.

Circle the anomaly in Table 1.

Look at Table 1 on page 9.

What conclusion can be made as the temperature increases?

Tick one box.

Decreases the rate of reaction up to 30 °C

Decreases the rate of reaction up to 40 °C

Increases the rate of reaction up to 30 °C

Increases the rate of reaction up to 40 °C

At which temperature was catalase denatured?

Tick one box.

10 °C

30 °C

60 °C

The student thought the optimum temperature for catalase activity was between 30 °C and 40 °C.

How could the investigation be improved to find a more precise value for the optimum temperature?

Tick one box.

Do the experiment at 70 °C and 80 °C

Do the experiment at 30 °C, 35 °C and 40 °C

Use less hydrogen peroxide solution

Use more catalase solution

Amylase is the enzyme that controls the breakdown of starch to glucose.

Describe how the student could investigate the effect of pH on the breakdown of starch by amylase.

Catalase is an enzyme - AQA - GCSE Biology - Question 2 - 2018 - Paper 1

Worked Solution & Example Answer:Catalase is an enzyme - AQA - GCSE Biology - Question 2 - 2018 - Paper 1

Circle the anomaly in Table 1.

What conclusion can be made as the temperature increases?

At which temperature was catalase denatured?

How could the investigation be improved to find a more precise value for the optimum temperature?

Describe how the student could investigate the effect of pH on the breakdown of starch by amylase.

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