Please write clearly in block capitals.
Centre number Candidate number
Surname
Forename(s)
Candidate signature
I declare this is my own work.
A-level
BIOLOGY
Paper 1
June 2021 Morning Time allowed: 2 hours
Materials For Examiner’s Use
For this paper you must have:
a ruler with millimetre measurements Question Mark
a scientific calculator. 1
2
Instructions
3
Use black ink or black ball-point pen.
Fill in the boxes at the top of this page. 4
Answer all questions. 5
You must answer the questions in the spaces provided. Do not write 6
outside the box around each page or on blank pages.
7
If you need extra space for your answer(s), use the lined pages at the end of
this book. Write the question number against your answer(s). 8
Show all your working. 9
Do all rough work in this book. Cross through any work you do not want
10
to 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/E16 7402/1
, 2
Do not write
outside the
Answer all questions in the spaces provided. box
0 1 Figure 1 shows a cell from the lining of the ileum specialised for absorption of
products of digestion.
SGLT1 is a carrier protein found in the cell-surface membrane of this cell, it transports
glucose 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 ATP
hydrolase enzyme.
Explain the function of this ATP hydrolase.
[2 marks]
0 1 . 2 The movement of Na+ out of the cell allows the absorption of glucose into the
cell lining the ileum.
Explain how.
[2 marks]
*02*
IB/M/Jun20/7402/1
, 3
Do not write
outside the
box
0 1 .3 Describe and explain two features you would expect to find in a cell specialised for
absorption.
[2 marks]
1
2
Question 1 continues on the next page
Turn over ►
*03*
IB/M/Jun20/7402/1
, 4
Do not write
outside the
box
Figure 2 is a diagram of one SGLT1 carrier protein.
Figure 2
0 1
.4 Draw phospholipids on Figure 2 to show how the carrier protein, SGLT1, would fit into
the cell-surface membrane.
Do not draw more than eight phospholipids.
[2 marks]
*04*
IB/M/Jun20/7402/1
Centre number Candidate number
Surname
Forename(s)
Candidate signature
I declare this is my own work.
A-level
BIOLOGY
Paper 1
June 2021 Morning Time allowed: 2 hours
Materials For Examiner’s Use
For this paper you must have:
a ruler with millimetre measurements Question Mark
a scientific calculator. 1
2
Instructions
3
Use black ink or black ball-point pen.
Fill in the boxes at the top of this page. 4
Answer all questions. 5
You must answer the questions in the spaces provided. Do not write 6
outside the box around each page or on blank pages.
7
If you need extra space for your answer(s), use the lined pages at the end of
this book. Write the question number against your answer(s). 8
Show all your working. 9
Do all rough work in this book. Cross through any work you do not want
10
to 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/E16 7402/1
, 2
Do not write
outside the
Answer all questions in the spaces provided. box
0 1 Figure 1 shows a cell from the lining of the ileum specialised for absorption of
products of digestion.
SGLT1 is a carrier protein found in the cell-surface membrane of this cell, it transports
glucose 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 ATP
hydrolase enzyme.
Explain the function of this ATP hydrolase.
[2 marks]
0 1 . 2 The movement of Na+ out of the cell allows the absorption of glucose into the
cell lining the ileum.
Explain how.
[2 marks]
*02*
IB/M/Jun20/7402/1
, 3
Do not write
outside the
box
0 1 .3 Describe and explain two features you would expect to find in a cell specialised for
absorption.
[2 marks]
1
2
Question 1 continues on the next page
Turn over ►
*03*
IB/M/Jun20/7402/1
, 4
Do not write
outside the
box
Figure 2 is a diagram of one SGLT1 carrier protein.
Figure 2
0 1
.4 Draw phospholipids on Figure 2 to show how the carrier protein, SGLT1, would fit into
the cell-surface membrane.
Do not draw more than eight phospholipids.
[2 marks]
*04*
IB/M/Jun20/7402/1
