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AQA AS BIOLOGY Paper 2 June 2021 QP 7401/2
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AQA AS BIOLOGY Paper 2 June 2021 QP 7401/2
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AQA AS BIOLOGY Paper 2 June 2021 QP 7401/2Please write clearly in block capitals.
Centre number Candidate number
Surname
Forename(s)
Candidate signature
I declare this is my own work.
AS
BIOLOGY
Paper 2
Time allowed: 1 hour 30 minutes
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.
9
• Do all rough work in this book. Cross through any work you do not want
to be marked. TOTAL
Information
• The marks for the questions are shown in brackets.
• The maximum mark for this paper is 75.
*JUN217401201*
IB/M/Jun21/E14 7401/2
, 2
Do not write
outside the
Answer all questions in the spaces provided. box
0 1 . 1 The general structure of a fatty acid is RCOOH.
Name the group represented by COOH.
[1 mark]
0 1 . 2 Figure 1 shows the structure of a fatty acid R group.
Figure 1
Name the type of R group shown in Figure 1.
Explain your answer.
[2 marks]
Type of R group
Explanation
0 1 . 3 Describe how you would test for the presence of a lipid in a liquid sample of food.
[2 marks]
*02*
IB/M/Jun21/7401/2
, 3
Do not write
outside the
In 1935, scientists suggested a model for the chemical structure of a cell-surface box
membrane. Figure 2 shows the membrane structure the scientists suggested.
Figure 2
0 1 . 4 Give one similarity and two differences between the membrane structure shown in
Figure 2 and the fluid-mosaic model of membrane structure.
[3 marks]
Similarity
Difference 1
Difference 2
8
Turn over for the next question
Turn over ►
*03*
IB/M/Jun21/7401/2
, 4
Do not write
outside the
0 2 . 1 Describe and explain one feature of the alveolar epithelium that makes the epithelium box
well adapted as a surface for gas exchange. Do not refer to surface area or moisture
in your answer.
[2 marks]
*04*
IB/M/Jun21/7401/2
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