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Please write clearly in block capitals.
Centre number Candidate number
Surname
Forename(s)
Candidate signat ure
I declare this is my own work.
A-level
BIOLOGY
Paper 1
Wednesday 5 June 2024 Afternoon 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
Instructions 2
Use black ink or black ball-point pen. 3
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
outside the box around each page or on blank pages. 6
If you need extra space for your answer(s), use the lined pages at the end of 7
this book. Write the question number against your answer(s). 8
Show all your working.
Do all rough work in this book. Cross through any work you do not want 9
to be marked. 10
TOTAL
Information
The marks for the questions are shown in brackets.
The maximum mark for this paper is 91.
IB/M/Jun24/G4006/E11 7402/1
, 2
Do not write
outside the
Answer all questions in the spaces provided. box
0 1 . 1 Figure 1 shows the structure of a fatty acid molecule and the structure of a glycerol
molecule.
Figure 1
On Figure 1, draw a circle around the part of the fatty acid molecule and the part of
the glycerol molecule that is removed to form a bond in a triglyceride molecule.
Name the bond formed between a fatty acid and glycerol in a triglyceride molecule.
Name the reaction involved in forming a bond between a fatty acid and glycerol in a
triglyceride molecule.
[3 marks]
Bond
Reaction
IB/M/Jun24/7402/1
, 3
Do not write
outside the
Table 1 shows information about three fatty acids. box
Table 1
0 1 . 2 Name the fatty acid shown in Table 1 that is a saturated fatty acid.
[1 mark]
0 1 . 3 The melting point is the temperature at which a solid changes state to be a liquid.
Use Table 1 to describe the relationship between fatty acid structure and fatty acid
melting point.
[1 mark]
Question 1 continues on the next page
Turn over ►
IB/M/Jun24/7402/1
, 4
Do not write
outside the
0 1 . 4 The ratio of saturated to unsaturated fatty acids in a cell-surface membrane box
determines the extent of the membrane‟s fluidity.
Scientists provided a cell culture of mouse phagocytes with liquid broth rich in
unsaturated fatty acids.
The scientists observed:
an increase in the proportion of phospholipids in the phagocytes containing
unsaturated fatty acids
more phagocytosis.
Suggest and explain why there was more phagocytosis.
[3 marks]
8
IB/M/Jun24/7402/1
Please write clearly in block capitals.
Centre number Candidate number
Surname
Forename(s)
Candidate signat ure
I declare this is my own work.
A-level
BIOLOGY
Paper 1
Wednesday 5 June 2024 Afternoon 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
Instructions 2
Use black ink or black ball-point pen. 3
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
outside the box around each page or on blank pages. 6
If you need extra space for your answer(s), use the lined pages at the end of 7
this book. Write the question number against your answer(s). 8
Show all your working.
Do all rough work in this book. Cross through any work you do not want 9
to be marked. 10
TOTAL
Information
The marks for the questions are shown in brackets.
The maximum mark for this paper is 91.
IB/M/Jun24/G4006/E11 7402/1
, 2
Do not write
outside the
Answer all questions in the spaces provided. box
0 1 . 1 Figure 1 shows the structure of a fatty acid molecule and the structure of a glycerol
molecule.
Figure 1
On Figure 1, draw a circle around the part of the fatty acid molecule and the part of
the glycerol molecule that is removed to form a bond in a triglyceride molecule.
Name the bond formed between a fatty acid and glycerol in a triglyceride molecule.
Name the reaction involved in forming a bond between a fatty acid and glycerol in a
triglyceride molecule.
[3 marks]
Bond
Reaction
IB/M/Jun24/7402/1
, 3
Do not write
outside the
Table 1 shows information about three fatty acids. box
Table 1
0 1 . 2 Name the fatty acid shown in Table 1 that is a saturated fatty acid.
[1 mark]
0 1 . 3 The melting point is the temperature at which a solid changes state to be a liquid.
Use Table 1 to describe the relationship between fatty acid structure and fatty acid
melting point.
[1 mark]
Question 1 continues on the next page
Turn over ►
IB/M/Jun24/7402/1
, 4
Do not write
outside the
0 1 . 4 The ratio of saturated to unsaturated fatty acids in a cell-surface membrane box
determines the extent of the membrane‟s fluidity.
Scientists provided a cell culture of mouse phagocytes with liquid broth rich in
unsaturated fatty acids.
The scientists observed:
an increase in the proportion of phospholipids in the phagocytes containing
unsaturated fatty acids
more phagocytosis.
Suggest and explain why there was more phagocytosis.
[3 marks]
8
IB/M/Jun24/7402/1
