AQA June 2022 A-level BIOLOGY Paper 3 7402/3

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A-level
BIOLOGY
Paper 3


Time allowed: 2 hours
Materials For Examiner’s Use
For this paper you must have:
 a ruler with millimetre measurements Questio Mark
 a scientific calculator. n
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.
5
 Answer one question from Section B.
 You must answer the questions in the spaces provided. Do 6
not write outside the box around each page or on blank TOTAL
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 want to be marked.

Information
 The marks for the questions are shown in brackets.
 The maximum mark for this paper is 78.




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,IB/M/Jun22/ 7402/3
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, 2
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outside the
There are no questions printed on this page box




DO NOT WRITE ON THIS PAGE
ANSWER IN THE SPACES PROVIDED




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, 3
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 1acids are used to make proteins. Table 1 shows the R groups of six different
Amino
amino acids.

Table 1

Amino acid R group Amino acid R group

Alanine CH3 Glutamic acid CH2CH2COOH

Asparagine CH2CONH2 Glycine H

Aspartic acid CH2COOH Serine CH2OH



0 1 .1 Use Table 1 to identify the three different amino acids used to make the
polypeptide shown in Figure 1.
[2 marks]

Figure 1




Question 1 continues on the next page




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