PMT
Please check the examination details below before entering your candidate information
Candidate surname Other names
Centre Number Candidate Number
Pearson Edexcel International Advanced Level
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.
• centrethe
Fill in boxes at the top of this page with your name,
number and learner registration number.
• Answer all questions.
• Answer the questions in the spaces provided
– there may be more space than you need.
• Calculators may be used.
• You must show all your working out with your answer clearly identified
at the end of your solution.
Information
• The total mark for this paper is 90.
• – usemarks
The for each question are shown in brackets
this as a guide as to how much time to spend on each question.
• Any diagrams may NOT be accurately drawn, unless otherwise indicated.
• Instructure
questions marked 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.
• your answers if you have time at the end.
Check
Turn over
P67105A
©2021 Pearson Education Ltd.
E:1/1/1/1/1/1/
*P67105A0136*
, PMT
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
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
V
P
(a) (i) Which row in the table identifies the structures labelled P, Q and V?
(1)
P Q V
A DNA starch grain ribosome
B starch grain DNA ribosome
C starch grain ribosome DNA
D ribosome starch grain DNA
2
*P67105A0236*
, PMT
(ii) Which structure contains GALP?
(1)
A Q
B R
C U
D V
(iii) The length of this chloroplast is 7.5 µm.
Calculate the magnification of this diagram.
(1)
Answer ........................................ . . . . . . . . . . . . . . . . . . . . . .
(iv) Structures T and U are membranes.
Compare and contrast the structure of these two membranes.
(3)
. . . . . . . . . . . .. .. .. .. .. .. .. .. .. .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............................................................................................................................................ .............. .. . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . .. .. .. .. .. .. .. .. .. .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............................................................................................................................................ .............. .. . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . .. .. .. .. .. .. .. .. .. .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............................................................................................................................................ .............. .. . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . .. .. .. .. .. .. .. .. .. .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............................................................................................................................................ .............. .. . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . .. .. .. .. .. .. .. .. .. .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............................................................................................................................................ .............. .. . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . .. .. .. .. .. .. .. .. .. .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............................................................................................................................................ .............. .. . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . .. .. .. .. .. .. .. .. .. .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............................................................................................................................................ .............. .. . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . .. .. .. .. .. .. .. .. .. .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............................................................................................................................................ .............. .. . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . .. .. .. .. .. .. .. .. .. .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............................................................................................................................................ .............. .. . . . . . . . . . . . . . . . . . . . .
3
*P67105A0336* Turn over
, PMT
(b) An investigation studied the effect of periods of light and dark on the levels of
chloroplast DNA in one species of a single-celled organism.
One group of these organisms, group A, was exposed to 36 hours of
continuous light.
The other group of these organisms, group B, was exposed to 12 hours of light,
followed by 12 hours of darkness, followed by 12 hours of light.
The graph shows the results of this investigation.
18
16 Group A
14
12
10 Group B
Mean level of chloroplast
DNA per cell / a.u.
8
6
4
2
0
0 4 8 12 16 20 24 28 32 36
Time / hours
These organisms divide by mitosis followed by cell division, during the dark.
Describe two conclusions that can be made about the replication of
chloroplast DNA.
(2)
. . . . . . . . . . . .. .. .. .. .. .. .. .. .. .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............................................................................................................................................ .............. .. . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . .. .. .. .. .. .. .. .. .. .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............................................................................................................................................ .............. .. . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . .. .. .. .. .. .. .. .. .. .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............................................................................................................................................ .............. .. . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . .. .. .. .. .. .. .. .. .. .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............................................................................................................................................ .............. .. . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . .. .. .. .. .. .. .. .. .. .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............................................................................................................................................ .............. .. . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . .. .. .. .. .. .. .. .. .. .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............................................................................................................................................ .............. .. . . . . . . . . . . . . . . . . . . . .
(Total for Question 1 = 8 marks)
4
*P67105A0436*
Please check the examination details below before entering your candidate information
Candidate surname Other names
Centre Number Candidate Number
Pearson Edexcel International Advanced Level
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.
• centrethe
Fill in boxes at the top of this page with your name,
number and learner registration number.
• Answer all questions.
• Answer the questions in the spaces provided
– there may be more space than you need.
• Calculators may be used.
• You must show all your working out with your answer clearly identified
at the end of your solution.
Information
• The total mark for this paper is 90.
• – usemarks
The for each question are shown in brackets
this as a guide as to how much time to spend on each question.
• Any diagrams may NOT be accurately drawn, unless otherwise indicated.
• Instructure
questions marked 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.
• your answers if you have time at the end.
Check
Turn over
P67105A
©2021 Pearson Education Ltd.
E:1/1/1/1/1/1/
*P67105A0136*
, PMT
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
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
V
P
(a) (i) Which row in the table identifies the structures labelled P, Q and V?
(1)
P Q V
A DNA starch grain ribosome
B starch grain DNA ribosome
C starch grain ribosome DNA
D ribosome starch grain DNA
2
*P67105A0236*
, PMT
(ii) Which structure contains GALP?
(1)
A Q
B R
C U
D V
(iii) The length of this chloroplast is 7.5 µm.
Calculate the magnification of this diagram.
(1)
Answer ........................................ . . . . . . . . . . . . . . . . . . . . . .
(iv) Structures T and U are membranes.
Compare and contrast the structure of these two membranes.
(3)
. . . . . . . . . . . .. .. .. .. .. .. .. .. .. .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............................................................................................................................................ .............. .. . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . .. .. .. .. .. .. .. .. .. .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............................................................................................................................................ .............. .. . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . .. .. .. .. .. .. .. .. .. .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............................................................................................................................................ .............. .. . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . .. .. .. .. .. .. .. .. .. .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............................................................................................................................................ .............. .. . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . .. .. .. .. .. .. .. .. .. .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............................................................................................................................................ .............. .. . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . .. .. .. .. .. .. .. .. .. .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............................................................................................................................................ .............. .. . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . .. .. .. .. .. .. .. .. .. .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............................................................................................................................................ .............. .. . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . .. .. .. .. .. .. .. .. .. .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............................................................................................................................................ .............. .. . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . .. .. .. .. .. .. .. .. .. .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............................................................................................................................................ .............. .. . . . . . . . . . . . . . . . . . . . .
3
*P67105A0336* Turn over
, PMT
(b) An investigation studied the effect of periods of light and dark on the levels of
chloroplast DNA in one species of a single-celled organism.
One group of these organisms, group A, was exposed to 36 hours of
continuous light.
The other group of these organisms, group B, was exposed to 12 hours of light,
followed by 12 hours of darkness, followed by 12 hours of light.
The graph shows the results of this investigation.
18
16 Group A
14
12
10 Group B
Mean level of chloroplast
DNA per cell / a.u.
8
6
4
2
0
0 4 8 12 16 20 24 28 32 36
Time / hours
These organisms divide by mitosis followed by cell division, during the dark.
Describe two conclusions that can be made about the replication of
chloroplast DNA.
(2)
. . . . . . . . . . . .. .. .. .. .. .. .. .. .. .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............................................................................................................................................ .............. .. . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . .. .. .. .. .. .. .. .. .. .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............................................................................................................................................ .............. .. . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . .. .. .. .. .. .. .. .. .. .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............................................................................................................................................ .............. .. . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . .. .. .. .. .. .. .. .. .. .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............................................................................................................................................ .............. .. . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . .. .. .. .. .. .. .. .. .. .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............................................................................................................................................ .............. .. . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . .. .. .. .. .. .. .. .. .. .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............................................................................................................................................ .............. .. . . . . . . . . . . . . . . . . . . . .
(Total for Question 1 = 8 marks)
4
*P67105A0436*
