AQA A LEVEL BIOLOGY PAPER 1 2021 QUESTION PAPER

*JUN217402101*

IB/H/Jun21/E14 7402/1

A-level

BIOLOGY

Paper 1

JUNE 2021

Time allowed: 2 hours

Materials

For this paper you must have:

 a ruler with millimetre measurements

 a scientific calculator.

Instructions

 Use black ink or black ball-point pen.

 Fill in the boxes at the top of this page.

 Answer all questions.

 You must answer the questions in the spaces provided. Do not write

outside the box around each page or on blank pages.

 If you need extra space for your answer(s), use the lined pages at the end of

this book. Write the question number against your answer(s).

 Show all your working.

 Do all rough work in this book. Cross through any work you do not want

to be marked.

Information

 The marks for the questions are shown in brackets.

 The maximum mark for this paper is 91.

For Examiner’s Use

Question Mark

1

2

3

4

5

6

7

8

9

10

TOTAL

Please write clearly in block capitals.

Centre number Candidate number

Surname

Forename(s)

Candidate signature

I declare this is my own work.

 1 / 4

*JUN217402101*

IB/H/Jun21/E14 7402/1

 2 / 4

2

Do not write

outside the

*02*

IB/H/Jun21/7402/1

Answer all questions in the spaces provided. box

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

catalyst.

[3 marks]

. 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 / 4

3

Do not write

outside the

*03*

IB/H/Jun21/7402/1

. 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.

box

Figure 1 shows the scientists’ results.

Figure 1

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

[2 marks]

. Explain the change in ATP concentration with increasing inorganic phosphate

concentration.

[2 marks]

Turn over ►

8

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 4 / 4

aamran11 4 months ago

Hi, just bought this. Where is the mark scheme

aamran11 4 months ago

Hi, just bought this. Where is the mark scheme

aamran11 4 months ago

Hi, just bought this. Where is the mark scheme
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