Please check the examination details below before entering your candidate information
Candidate surname Other names
Centre Number Candidate Number
Pearson Edexcel International Advanced Level
Friday 10 January 2025
Morning (Time: 1 hour 30 minutes) Paper
reference WBI11/01
Biology
International Advanced Subsidiary/Advanced Level
UNIT 1: Molecules, Diet, Transport and Health
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.
•• 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 80.
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
In questions marked with an asterisk (*), marks will be awarded for your ability to
your answer logically, showing how the points 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
P78442A
©2025 Pearson Education Ltd.
H:1/1/1/1/1/1/
*P78442A0132*
, 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 DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA
answer, put a line through the box and then mark your new answer with a cross .
1 The polysaccharides and proteins that we eat are digested. The products of digestion
are then transported in the blood plasma as a solution in water.
(a) Which of the following statements about water are correct?
1. A single molecule of water is composed of an oxygen atom joined to
two hydrogen atoms by hydrogen bonds.
2. Water is a solvent.
3. The oxygen in a water molecule has a small negative charge and the
hydrogen atoms each have a small positive charge.
(1)
A 1 and 2 only
B 1 and 3 only
C 2 and 3 only
D 1, 2 and 3
(b) The table shows some information about the structure of amylose
and amylopectin.
Put one cross in the appropriate box in each row to show whether the structure
is present in these molecules.
(3)
Structure found in
Structure both neither
amylopectin
amylose only amylose and amylose nor
only
amylopectin amylopectin
glycosidic bonds
1‑4 α bonds
branched side chains
2
*P78442A0232*
, (c) The diagram shows parts of two amino acids.
Complete the diagram to show a peptide bond joining these two amino acids.
DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA
(1)
R R
H O
N C C C
H OH
H H
peptide bond
(Total for Question 1 = 5 marks)
3
*P78442A0332* Turn over
,DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA
*P78442A0432*
BLANK PAGE
4
Candidate surname Other names
Centre Number Candidate Number
Pearson Edexcel International Advanced Level
Friday 10 January 2025
Morning (Time: 1 hour 30 minutes) Paper
reference WBI11/01
Biology
International Advanced Subsidiary/Advanced Level
UNIT 1: Molecules, Diet, Transport and Health
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.
•• 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 80.
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
In questions marked with an asterisk (*), marks will be awarded for your ability to
your answer logically, showing how the points 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
P78442A
©2025 Pearson Education Ltd.
H:1/1/1/1/1/1/
*P78442A0132*
, 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 DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA
answer, put a line through the box and then mark your new answer with a cross .
1 The polysaccharides and proteins that we eat are digested. The products of digestion
are then transported in the blood plasma as a solution in water.
(a) Which of the following statements about water are correct?
1. A single molecule of water is composed of an oxygen atom joined to
two hydrogen atoms by hydrogen bonds.
2. Water is a solvent.
3. The oxygen in a water molecule has a small negative charge and the
hydrogen atoms each have a small positive charge.
(1)
A 1 and 2 only
B 1 and 3 only
C 2 and 3 only
D 1, 2 and 3
(b) The table shows some information about the structure of amylose
and amylopectin.
Put one cross in the appropriate box in each row to show whether the structure
is present in these molecules.
(3)
Structure found in
Structure both neither
amylopectin
amylose only amylose and amylose nor
only
amylopectin amylopectin
glycosidic bonds
1‑4 α bonds
branched side chains
2
*P78442A0232*
, (c) The diagram shows parts of two amino acids.
Complete the diagram to show a peptide bond joining these two amino acids.
DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA
(1)
R R
H O
N C C C
H OH
H H
peptide bond
(Total for Question 1 = 5 marks)
3
*P78442A0332* Turn over
,DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA
*P78442A0432*
BLANK PAGE
4
