AQA A-level BIOLOGY 7402/3 Paper 3 Question Paper + Mark scheme [MERGED] June 2022

AQA

A-level

BIOLOGY

7402/3

Paper 3

Question Paper + Mark scheme [MERGED]

June 2022

*jun227402301*

IB/M/Jun22/E10 7402/3

For Examiner’s Use

Question Mark

1

2

3

4

5

6

TOTAL

Time allowed: 2 hours

Materials

For this paper you must have:

• a ruler with millimetre measurements

• a scientific calculator.

Instructions

• Use black ink or black ball-point pen.

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

• Answer all questions in Section A.

• Answer one question from Section B.

• You must answer the questions in the spaces provided. Do not 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 want

to be marked.

Information

• The marks for the questions are shown in brackets.

• The maximum mark for this paper is 78.

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 3

2

*02*

IB/M/Jun22/7402/3

Do not write

outside the

There are no questions printed on this page box

DO NOT WRITE ON THIS PAGE

ANSWER IN THE SPACES PROVIDED

3

*03*

Turn over ►

IB/M/Jun22/7402/3

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

amino acids.

Table 1

Amino acid R group

Alanine CH3

Asparagine CH2CONH2

Aspartic acid CH2COOH

Amino acid R group

Glutamic acid CH2CH2COOH

Glycine H

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

Left amino acid

Middle amino acid

Right amino acid

Question 1 continues on the next page