AQA A-LEVEL BIOLOGY PAPER 2
Please write clearly in block capitals.
Centre number Candidate number
Surname
Forename(s)
Candidate signature
I declare this is my own work.
A-level
BIOLOGY
Paper 2
Time allowed: 2 hours
Materials
For Examiner’s Use
For this paper you must have:
• 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.
5
• You must answer the questions in the spaces provided. Do not write
outside the box around each page or on blank pages. 6
• If you need extra space for your answer(s), use the lined pages at the end of 7
this book. Write the question number against your answer(s).
8
• Show all your working.
• Do all rough work in this book. Cross through any work you do not want 9
to be marked. 10
TOTAL
Information
• The marks for the questions are shown in brackets.
• The maximum mark for this paper is 91.
*JUN217402201*
IB/H/Jun21/E14 7402/2
, 2
Do not write
outside the
Answer all questions in the spaces provided. box
0 1 . 1 Describe the process of glycolysis.
[4 marks]
0 1 . 2 Malonate inhibits a reaction in the Krebs cycle.
Explain why malonate would decrease the uptake of oxygen in a respiring cell.
[2 marks]
6
*02*
IB/H/Jun21/7402/2
, 3
Do not write
outside the
0 2 . 1 Explain how a resting potential is maintained across the axon membrane in a box
neurone.
[3 marks]
0 2 . 2 Explain why the speed of transmission of impulses is faster along a myelinated axon
than along a non-myelinated axon.
[3 marks]
Question 2 continues on the next page
Turn over ►
*03*
IB/H/Jun21/7402/2
, 4
Do not write
outside the
0 2 . 3 A scientist investigated the effect of inhibitors on neurones. She added a respiratory box
inhibitor to a neurone. The resting potential of the neurone changed from –70 mV
to 0 mV.
Explain why.
[3 marks]
9
*04*
IB/H/Jun21/7402/2
Please write clearly in block capitals.
Centre number Candidate number
Surname
Forename(s)
Candidate signature
I declare this is my own work.
A-level
BIOLOGY
Paper 2
Time allowed: 2 hours
Materials
For Examiner’s Use
For this paper you must have:
• 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.
5
• You must answer the questions in the spaces provided. Do not write
outside the box around each page or on blank pages. 6
• If you need extra space for your answer(s), use the lined pages at the end of 7
this book. Write the question number against your answer(s).
8
• Show all your working.
• Do all rough work in this book. Cross through any work you do not want 9
to be marked. 10
TOTAL
Information
• The marks for the questions are shown in brackets.
• The maximum mark for this paper is 91.
*JUN217402201*
IB/H/Jun21/E14 7402/2
, 2
Do not write
outside the
Answer all questions in the spaces provided. box
0 1 . 1 Describe the process of glycolysis.
[4 marks]
0 1 . 2 Malonate inhibits a reaction in the Krebs cycle.
Explain why malonate would decrease the uptake of oxygen in a respiring cell.
[2 marks]
6
*02*
IB/H/Jun21/7402/2
, 3
Do not write
outside the
0 2 . 1 Explain how a resting potential is maintained across the axon membrane in a box
neurone.
[3 marks]
0 2 . 2 Explain why the speed of transmission of impulses is faster along a myelinated axon
than along a non-myelinated axon.
[3 marks]
Question 2 continues on the next page
Turn over ►
*03*
IB/H/Jun21/7402/2
, 4
Do not write
outside the
0 2 . 3 A scientist investigated the effect of inhibitors on neurones. She added a respiratory box
inhibitor to a neurone. The resting potential of the neurone changed from –70 mV
to 0 mV.
Explain why.
[3 marks]
9
*04*
IB/H/Jun21/7402/2
