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
Thursday 5 June 2025 Afternoon Time allowed: 2 hours
Materials For Examiner’s Use
For this paper you must have:
Question Mark
• a ruler with millimetre measurements
• a scientific calculator. 1
2
Instructions 3
• Use black ink or black ball-point pen.
4
• Fill in the boxes at the top of this page.
• 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.
*jun257402101*
IB/M/Jun25/G4007/V8 7402/1
, 2
Do not write
outside the
Answer all questions in the spaces provided. box
0 1 . 1 The digestion and absorption of lipids involves:
• emulsification by bile salts
• micelles.
Explain each of the following.
[4 marks]
The importance of emulsification in the digestion of lipids
The role of micelles in the absorption of lipids
0 1 . 2 Describe and explain the arrangement of phospholipid molecules in the cell-surface
membrane.
[2 marks]
6
*02*
IB/M/Jun25/7402/1
, 3
Do not write
outside the
0 2 . 1 Describe how mRNA is obtained from pre-mRNA. box
[1 mark]
0 2 . 2 Describe how RNA polymerase joins RNA nucleotides.
[2 marks]
Question 2 continues on the next page
Turn over ►
*03*
IB/M/Jun25/7402/1
, 4
Do not write
outside the
0 2 . 3 Figure 1 shows the energy contained in molecules during an enzyme-controlled box
reaction.
Figure 1
Which expression represents the activation energy (Ea) of this reaction?
Tick () one box.
[1 mark]
A–C
D–C
D–C
B
D
*04*
IB/M/Jun25/7402/1
Centre number Candidate number
Surname
Forename(s)
Candidate signature
I declare this is my own work.
A-level
BIOLOGY
Paper 1
Thursday 5 June 2025 Afternoon Time allowed: 2 hours
Materials For Examiner’s Use
For this paper you must have:
Question Mark
• a ruler with millimetre measurements
• a scientific calculator. 1
2
Instructions 3
• Use black ink or black ball-point pen.
4
• Fill in the boxes at the top of this page.
• 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.
*jun257402101*
IB/M/Jun25/G4007/V8 7402/1
, 2
Do not write
outside the
Answer all questions in the spaces provided. box
0 1 . 1 The digestion and absorption of lipids involves:
• emulsification by bile salts
• micelles.
Explain each of the following.
[4 marks]
The importance of emulsification in the digestion of lipids
The role of micelles in the absorption of lipids
0 1 . 2 Describe and explain the arrangement of phospholipid molecules in the cell-surface
membrane.
[2 marks]
6
*02*
IB/M/Jun25/7402/1
, 3
Do not write
outside the
0 2 . 1 Describe how mRNA is obtained from pre-mRNA. box
[1 mark]
0 2 . 2 Describe how RNA polymerase joins RNA nucleotides.
[2 marks]
Question 2 continues on the next page
Turn over ►
*03*
IB/M/Jun25/7402/1
, 4
Do not write
outside the
0 2 . 3 Figure 1 shows the energy contained in molecules during an enzyme-controlled box
reaction.
Figure 1
Which expression represents the activation energy (Ea) of this reaction?
Tick () one box.
[1 mark]
A–C
D–C
D–C
B
D
*04*
IB/M/Jun25/7402/1
