AQA A Level Biology 2021 Paper 1 Question Paper

AQA A Level Biology 2021 Paper 1 Question Paper


Describe the induced-fit model of enzyme action and how an enzyme acts as a

catalyst.

[3 marks]

0 1 . 2 Scientists investigated the action of the enzyme ATP synthase. They made reaction

mixtures each containing:

• ATP synthase

• buffer (to control pH)

• substrates.

One of the substrates required in these reaction mixtures is inorganic phosphate (Pi).

Tick () one box to show which other substrate the scientists must add to the reaction

mixtures to produce ATP.

[1 mark]

Adenine

Adenosine diphosphate

Glucose

Ribose

3

*03*

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outside the

box 0 1 . 3 The scientists investigated the effect of concentration of inorganic phosphate (Pi) on

ATP synthase activity.

After 2 minutes, they stopped each reaction and then measured the concentration of

ATP.

Figure 1 shows the scientists’ results.

Figure 1

Suggest and explain a procedure the scientists could have used to stop each reaction.

[2 marks]

0 1 . 4 Explain the change in ATP concentration with increasing inorganic phosphate

concentration.

[2 marks]

8

4

*04*

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outside the

box 0 2 . 1 Explain the advantage for larger animals of having a specialised system that

facilitates oxygen uptake.

[2 marks]

5

*05*

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outside the

Figure 2 shows two models of oxygen uptake found in animals. box

Figure 2

0 2 . 2 Suggest how the environmental conditions have resulted in adaptations of systems

using Model A rather than Model B.

[2 marks]

Question 2 continues on the next page

6

*06*

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outside the

0 2 box . 3 Figure 3 shows changes in concentration of oxygen in two gas exchange systems.

Figure 3

A student studied Figure 3 and concluded that the fish gas exchange system is more

efficient than the human gas exchange system.

Use Figure 3 to justify this conclusion

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Category AQA Questions and Marking Scheme
Authors Qwivy.com
Pages 40
Language English
Tags AQA A Level Biology 2021 Paper 1 Question Paper 1
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