2023 AQA A-level BIOLOGY 7402/3 Paper 3
Question Paper & Mark scheme (Merged) June
2023 [VERIFIED]
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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
• a scientific calculator. Question Mark
1
Instructions 2
• Use black ink or black ball-point pen.
3
• Fill in the boxes at the top of this page.
• Answer all questions in Section A. 4
• Answer one question from Section B. 5
• You must answer the questions in the spaces provided. Do not 6
write 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.
, 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
*02*
IB/M/Jun23/7402/3
, 3
Do not write
outside the
0 1 . 2Use 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 ►
*03*
IB/M/Jun23/7402/3
, 4
Do not write
outside the
0 2A student investigated the effect of different sugars on the rate of respiration in yeast. Yeast box
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
*04*
IB/M/Jun23/7402/3
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