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AQA A level BIOLOGY Paper 3 June 2023 official question paper-7402/3
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A-level BIOLOGY Paper 3 June 2023 official question paper
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ALPlease write clearly in block capitals.
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A-level
BIOLOGY
Paper 3
Wednesday 21 June 2023 Morning Time allowed: 2 hours
Materials
For this paper you must have: For Examiner’s Use
a ruler with millimetre measurements
Question Mark
a scientific calculator.
1
Instructions 2
Use black ink or black ball-point pen. 3
Fill in the boxes at the top of this page.
4
Answer all questions in Section A.
Answer one question from Section B. 5
You must answer the questions in the spaces provided. Do not write 6
outside the box around each page or on blank pages. 7
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). TOTAL
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 78.
IB/M/Jun23/E12 7402/3
, 2
Do not write
outside the
Section A box
Answer all questions in this section.
You are advised to spend no more than 1 hour and 15 minutes on this section.
0 1 . 1 Describe how stimulation of a Pacinian corpuscle produces a generator potential.
[3 marks]
Scientists investigated the stimulation of a Pacinian corpuscle in the skin of a fingertip.
The scientists applied two different pressures to the fingertip and recorded the
changes in membrane potential of the Pacinian corpuscle’s sensory neurone.
Figure 1 shows the scientists’ results.
Figure 1
IB/M/Jun23/7402/3
, 3
Do not write
outside the
0 1 . 2 Use Figure 1 to describe what is meant by the all-or-nothing principle. box
[2 marks]
0 1 . 3 On Figure 1, from 0.6 ms to 4.0 ms, no new generator potential could be produced.
What is this time period called?
[1 mark]
6
Turn over for the next question
Turn over ►
IB/M/Jun23/7402/3
, 4
Do not write
outside the
0 2 A student investigated the effect of different sugars on the rate of respiration in yeast. box
Yeast normally respires glucose.
Figure 2 shows the method she used for her first experiment.
Figure 2
0 2 . 1 Other than those stated, suggest two variables the student needed to keep constant
in her investigation.
[1 mark]
1
2
IB/M/Jun23/7402/3
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