AS BIOLOGY Paper 2 JUNE 2021 QUESTION PAPER/AQA AS BIOLOGY 7401/2 Paper 2 Question Paper June 2021 Version: 1.0 Final

Please write clearly in block capitals.

Centre

number

Candidate

number

Surname

Forename(s)

Candidate

signatu

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*JUN217401201*

IB/M/Jun21/ 7401/2

E14

AqABIOLOGY2021

AS

BIOLOGY

Paper 2

JUNE 2021

Time allowed: 1 hour 30 minutes

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.

 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 75.

For Examiner’s Use

Questio

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Mark

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TOTAL

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Answer all questions in the spaces

provided.

box

. 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

. Describe how you would test for the presence of a lipid in a liquid sample of food.

[2 marks]

8

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In 1935, scientists suggested a model for the chemical structure of a

cell-surface membrane. Figure 2 shows the membrane structure the

scientists suggested.

Figure 2

Turn over for the next question

box

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

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