Please check the examination details below before entering your candidate information
Candidate surname Other names
Centre Number Candidate Number
Pearson Edexcel International Advanced Level
Thursday 19 October 2023
Morning (Time: 1 hour 45 minutes) Paper
reference WBI14/01
Biology
International Advanced Level
UNIT 4: Energy, Environment, Microbiology
and Immunity
You must have: Total Marks
Scientific calculator, ruler, HB pencil
Instructions
•• Use black ink or ball-point pen.
Fill in the boxes at the top of this page with your name,
centre number and candidate number.
•• Answer all questions.
Answer the questions in the spaces provided
– there may be more space than you need.
Information
•• The total mark for this paper is 90.
The marks for each question are shown in brackets
– use this as a guide as to how much time to spend on each question.
• structure
Questions labelled with an asterisk (*), marks will be awarded for your ability to
your answer logically, showing how the points that you make are related
or follow on from each other where appropriate.
Advice
•• Read each question carefully before you start to answer it.
Try to answer every question.
• Check your answers if you have time at the end.
Turn over
P75618A
©2023 Pearson Education Ltd.
Z:1/1/1/1/1/1/
*P75618A0136*
, Answer ALL questions. Write your answers in the spaces provided.
Some questions must be answered with a cross in a box . If you change your mind about an
DO NOT WRITE IN THIS AREA
answer, put a line through the box and then mark your new answer with a cross .
1 The structure of a chloroplast is related to its role in photosynthesis.
The diagram shows a chloroplast.
S
T
R U
Q
DO NOT WRITE IN THIS AREA
V
W
P
(a) Which is the site of photolysis?
(1)
A P
B R
C T
D V
(b) Which contains a gene coding for RUBISCO?
DO NOT WRITE IN THIS AREA
(1)
A P
B Q
C S
D V
2
*P75618A0236*
, (c) Where do hydrogen ions accumulate for use in photosynthesis?
(1)
DO NOT WRITE IN THIS AREA
A Q
B R
C S
D V
(d) (i) How many of the structures labelled P, T, U and W are made of phospholipids?
(1)
A 1
B 2
C 3
D 4
DO NOT WRITE IN THIS AREA
(ii) Which describes a phospholipid?
(1)
A glycerol attached to two fatty acids and one phosphate group
B glycerol attached to two fatty acids and two phosphate groups
C glycerol attached to three fatty acids and one phosphate group
D glycerol attached to three fatty acids and two phosphate groups
(e) The length of a cell was measured. It was found to be 0.0085 cm long.
The ratio of the length of this cell to the length of a chloroplast was 11.7 : 1.
Calculate the length of this chloroplast.
Give your answer in µm to 2 significant figures.
DO NOT WRITE IN THIS AREA
(2)
Answer. .......... ........... .......... ............... ............... µm
(Total for Question 1 = 7 marks)
3
*P75618A0336* Turn over
, 2 The body responds to infection with non-specific responses and the
immune response.
DO NOT WRITE IN THIS AREA
(a) Inflammation is characterised by heat, redness and two other characteristics.
(i) Name the two other characteristics of inflammation.
(1)
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(ii) Explain how heat helps the body respond to infection.
(2)
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DO NOT WRITE IN THIS AREA
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(b) Describe how interferon helps the body respond to infection.
(2)
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DO NOT WRITE IN THIS AREA
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4
*P75618A0436*
Candidate surname Other names
Centre Number Candidate Number
Pearson Edexcel International Advanced Level
Thursday 19 October 2023
Morning (Time: 1 hour 45 minutes) Paper
reference WBI14/01
Biology
International Advanced Level
UNIT 4: Energy, Environment, Microbiology
and Immunity
You must have: Total Marks
Scientific calculator, ruler, HB pencil
Instructions
•• Use black ink or ball-point pen.
Fill in the boxes at the top of this page with your name,
centre number and candidate number.
•• Answer all questions.
Answer the questions in the spaces provided
– there may be more space than you need.
Information
•• The total mark for this paper is 90.
The marks for each question are shown in brackets
– use this as a guide as to how much time to spend on each question.
• structure
Questions labelled with an asterisk (*), marks will be awarded for your ability to
your answer logically, showing how the points that you make are related
or follow on from each other where appropriate.
Advice
•• Read each question carefully before you start to answer it.
Try to answer every question.
• Check your answers if you have time at the end.
Turn over
P75618A
©2023 Pearson Education Ltd.
Z:1/1/1/1/1/1/
*P75618A0136*
, Answer ALL questions. Write your answers in the spaces provided.
Some questions must be answered with a cross in a box . If you change your mind about an
DO NOT WRITE IN THIS AREA
answer, put a line through the box and then mark your new answer with a cross .
1 The structure of a chloroplast is related to its role in photosynthesis.
The diagram shows a chloroplast.
S
T
R U
Q
DO NOT WRITE IN THIS AREA
V
W
P
(a) Which is the site of photolysis?
(1)
A P
B R
C T
D V
(b) Which contains a gene coding for RUBISCO?
DO NOT WRITE IN THIS AREA
(1)
A P
B Q
C S
D V
2
*P75618A0236*
, (c) Where do hydrogen ions accumulate for use in photosynthesis?
(1)
DO NOT WRITE IN THIS AREA
A Q
B R
C S
D V
(d) (i) How many of the structures labelled P, T, U and W are made of phospholipids?
(1)
A 1
B 2
C 3
D 4
DO NOT WRITE IN THIS AREA
(ii) Which describes a phospholipid?
(1)
A glycerol attached to two fatty acids and one phosphate group
B glycerol attached to two fatty acids and two phosphate groups
C glycerol attached to three fatty acids and one phosphate group
D glycerol attached to three fatty acids and two phosphate groups
(e) The length of a cell was measured. It was found to be 0.0085 cm long.
The ratio of the length of this cell to the length of a chloroplast was 11.7 : 1.
Calculate the length of this chloroplast.
Give your answer in µm to 2 significant figures.
DO NOT WRITE IN THIS AREA
(2)
Answer. .......... ........... .......... ............... ............... µm
(Total for Question 1 = 7 marks)
3
*P75618A0336* Turn over
, 2 The body responds to infection with non-specific responses and the
immune response.
DO NOT WRITE IN THIS AREA
(a) Inflammation is characterised by heat, redness and two other characteristics.
(i) Name the two other characteristics of inflammation.
(1)
.. .. ... .. ... .. ... .. ... .. ... ... .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .... .......... .. ........ .......... .......... .......... .......... .......... .......... .......... .......... .......... .......... .......... ...... .............. ..... .................
.. .. ... .. ... .. ... .. ... .. ... ... .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .... .......... .. ........ .......... .......... .......... .......... .......... .......... .......... .......... .......... .......... .......... ...... .............. ..... .................
(ii) Explain how heat helps the body respond to infection.
(2)
.. .. ... .. ... .. ... .. ... .. ... ... .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .... .......... .. ........ .......... .......... .......... .......... .......... .......... .......... .......... .......... .......... .......... ...... .............. ..... .................
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DO NOT WRITE IN THIS AREA
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(b) Describe how interferon helps the body respond to infection.
(2)
.. .. ... .. ... .. ... .. ... .. ... ... .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .... .......... .. ........ .......... .......... .......... .......... .......... .......... .......... .......... .......... .......... .......... ...... .............. ..... .................
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DO NOT WRITE IN THIS AREA
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4
*P75618A0436*
