Edexcel Level 3 GCE
Friday 16 June 2023
Biology B
Advanced
PAPER 2: Advanced Physiology, Evolution
and Ecology
Morning (Time: 1 hour 45 minutes)
9BI0/02
Paper
reference
,Total Marks
You must have:
Scientific calculator, HB pencil, ruler
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.
* In question(s) marked with an asterisk (*), marks will be awarded for your ability to
structure 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.
*P71910A0236*
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2
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 Carbohydrates and proteins are important biological molecules.
(a) The diagrams show some of the bonds found in biological molecules.
d-O
Hd+
d+H
Od-
,H
C
O
C
C
O
H
H
H
O
HH
C
C
V
W
X
C
N
C
C
O
H
C
C
S
S
Y
Z
(i) Which one of the letters shows a bond that joins glucose molecules together
in a disaccharide?
(1)
AW
, BX
CY
DZ
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3
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(ii) Which letters show bonds that hold together the tertiary structure of
a protein?
(1)
A V and X
B V and Z
C W and Y
D W and Z
(iii) Which letter shows a bond that holds together cellulose molecules within a
cellulose microfibril?
(1)
AV
BW
CX
DY
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