AQA A LEVEL BIOLOGY 7402/3 PAPER 3 QUESTION PAPER AND MARK SCHEME { MERGED}

AQA A LEVEL BIOLOGY 7402/3 PAPER 3
QUESTION PAPER AND MARK SCHEME {
MERGED}

, Centre number
Candidate number
Surname

Forename(s)

Candidate signature
I declare this is my own work.



A-level
Please write clearly in block capitals.
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

2

Instructions 3

• Use black ink or black ball-point pen. 4

• Fill in the boxes at the top of this page. 5

• Answer all questions in Section A. 6

• Answer one question from Section B. 7

• You must answer the questions in the spaces provided. Do not TOTAL
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
wantto be marked.

Information
• The marks for the questions are shown in brackets.

,• The maximum mark for this paper is 78.

, 2
Do not write
Section A outside
the
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