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AQA A LEVEL BIOLOGY PAPER 1 2020 QP - Copy
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A-levelBIOLOGY
Paper 1 June
2020
*JUN207402101
* IB/M/Jun20/ 7402/1
E16
, Please write clearly in block capitals.
A-level
Centre Candidate
BIOLOGY
number number
Paper1
Surname
Forename(s)
Candidate ure
Thursday
signat 4 June 2020 Morning Timeallowed:2hours
Materials For IExaminer’s
For this paper you must have: IUse
a ruler with millimetre measurements Questio Mark
a scientific calculator. n
1
Instructions 2
Use black ink or black ball-point pen.
3
Fill in the boxes at the top of this page.
Answer all questions. 4
You must answer the questions in the spaces 5
provided. Do not writeoutside the box around each
6
page or on blank pages.
If you need extra space for your answer(s), use the lined pages 7
at the end ofthis book. Write the question number against your 8
answer(s). 9
Show all your working.
10
Do all rough work in this book. Cross through any work
you do not wantto be marked. TOTAL
Information
The marks for the questions are shown in brackets.
The maximum mark for this paper is 91.
*JUN207402101
* IB/M/Jun20/ 7402/1
E16
, 2
Do not
Answer all questions in the spaces writeout
box
provided.
0 1 Figure 1 shows a cell from the lining of the ileum specialised for
absorption ofproducts of digestion.
SGLT1 is a carrier protein found in the cell-surface membrane of
this cell, it transportsgI lucose and sodium ions (Na+) into the cell.
Figure 1
0 1 .1 The action of the carrier protein X in Figure 1 is linked to a
membrane-bound ATPhydrolase enzyme.
Explain the function of this ATP hydrolase.
[2 marks]
. The movement of Na+ out of the cell allows the absorption of
0 1 2
glucose into
theIcell lining the ileum.
Explain how.
[2 marks]
*02
IB/M/
, 3
Do
not
e the box
0 1 . I3 Describe and explain two features you would expect to find in a cell
specialised forabsorption.
[2 marks]
1
2
Question 1 continues on the next page
Turn over ►
*03
IB/M/
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