Edexcel Level 3 GCE
Wednesday 7 June 2023
Biology B
Advanced
PAPER 1: Advanced Biochemistry,
Microbiology and
Genetics
,Afternoon (Time: 1 hour 45 minutes)
9BI0/01
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.
P71909A
(c)2023 Pearson Education Ltd.
N:1/1/1/1/
*P71909A0232*
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2
Answer ALL questions.
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 Plants take up inorganic ions from the soil.
These ions include calcium, phosphate and potassium.
(a) (i) Name the molecule that contains calcium ions in the cell walls of a plant.
(1)
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(ii) How many of the following statements are correct?
(1)
*
phosphate ions are used to make DNA and RNA
*
phosphate ions are used in the structure of the cell membrane
*
the element potassium is part of a peptide bond
A none
B one only
C two only
D three
(b) The uptake of potassium ions by plant seedlings in anaerobic and aerobic
conditions was investigated.
The seedlings were grown in a mineral ion solution containing a low
concentration of potassium ions for 30 hours. The conditions were anaerobic for
the first 15 hours and aerobic for the second 15 hours.
, *P71909A0332*
Turn over
3
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The graph shows the results of this investigation.
increase
Change in concentration
of potassium ions in
the cells in the roots of
the seedlings
decrease
Time / hours
0
5
10
15
20
25
30
Explain the changes in the concentration of potassium ions in the cells in the
roots of the seedlings during this investigation.
(4)
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