AS BIOLOGY 7401/1 ACTUAL 2025
PAPER MERGED WITH MARK SCHEME
vincent marekia
[COMPANY NAME] [Company address]
tyrionpapers.com for more resources
, 1
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AS
BIOLOGY740
1/1 ACTUAL
2025
PAPER
MERGED
WITH MARK
SCHEME
Paper 1
Please write clearly in block capitals.
Candidate number
Centre number
Surname
Forename(s)
Candidate signature
I declare this is my own work.
AS
BIOLOGY
Paper 1
tyrionpapers.com for more resources
IB/M/Jun25/7401/1
, 2
Do not
write
outside the
box
Monday 12 May 2025 Morning Time allowed: 1 hour 30
minutes
Materials For Examiner’s Use
For this paper you must have:
Question Mark
• a ruler with millimetre measurements • a scientific calculator.
1
Instructions 2
• Use black ink or black ball-point pen.
• Fill in the boxes at the top of this page. 3
• Answer all questions. 4
• You must answer the questions in the spaces provided. Do not write outside
the box around each page or on blank pages. 5
• If you need extra space for your answer(s), use the lined pages at the end of
6
this book. Write the question number against your answer(s).
• Show all your working. 7
8
9
TOTAL
Information
• The marks for the questions are shown in brackets.
• The maximum mark for this paper is 75.
*jun257401101* IB/M/Jun25/G4002/V5 7401/1
• Do all rough work in this book. Cross through any work you do not want to be marked.
Answer all questions in the spaces provided.
.1 Figure 1 shows the structure of the amino acid alanine.
0 1
Figure 1
Turn over ►
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IB/M/Jun25/7401/1
, 3
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Name the NH2 and COOH groups in the amino acid.
[1 mark]
NH2
COOH
Figure 2 shows the molecule formed from alanine and another amino acid.
Figure 2
.2
0 1
Name the type of bond and the type of molecule formed when the two amino acids in
Figure 2 are joined.
[2 marks]
Type of bond
Type of molecule
*02*
Amino acid R group Amino acid R group
0 1
.3 Table 1 shows the R groups of six different amino acids.
Alanine CH3 Glycine H
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Aspartic acid CH2COOH Serine CH2OH IB/M/Jun25/7401/1
Glutamine (CH2)2CONH2 Valine CH(CH3)2
PAPER MERGED WITH MARK SCHEME
vincent marekia
[COMPANY NAME] [Company address]
tyrionpapers.com for more resources
, 1
Do not
write
outside the
box
AS
BIOLOGY740
1/1 ACTUAL
2025
PAPER
MERGED
WITH MARK
SCHEME
Paper 1
Please write clearly in block capitals.
Candidate number
Centre number
Surname
Forename(s)
Candidate signature
I declare this is my own work.
AS
BIOLOGY
Paper 1
tyrionpapers.com for more resources
IB/M/Jun25/7401/1
, 2
Do not
write
outside the
box
Monday 12 May 2025 Morning Time allowed: 1 hour 30
minutes
Materials For Examiner’s Use
For this paper you must have:
Question Mark
• a ruler with millimetre measurements • a scientific calculator.
1
Instructions 2
• Use black ink or black ball-point pen.
• Fill in the boxes at the top of this page. 3
• Answer all questions. 4
• You must answer the questions in the spaces provided. Do not write outside
the box around each page or on blank pages. 5
• If you need extra space for your answer(s), use the lined pages at the end of
6
this book. Write the question number against your answer(s).
• Show all your working. 7
8
9
TOTAL
Information
• The marks for the questions are shown in brackets.
• The maximum mark for this paper is 75.
*jun257401101* IB/M/Jun25/G4002/V5 7401/1
• Do all rough work in this book. Cross through any work you do not want to be marked.
Answer all questions in the spaces provided.
.1 Figure 1 shows the structure of the amino acid alanine.
0 1
Figure 1
Turn over ►
tyrionpapers.com for more resources
IB/M/Jun25/7401/1
, 3
Do not
write
outside the
box
Name the NH2 and COOH groups in the amino acid.
[1 mark]
NH2
COOH
Figure 2 shows the molecule formed from alanine and another amino acid.
Figure 2
.2
0 1
Name the type of bond and the type of molecule formed when the two amino acids in
Figure 2 are joined.
[2 marks]
Type of bond
Type of molecule
*02*
Amino acid R group Amino acid R group
0 1
.3 Table 1 shows the R groups of six different amino acids.
Alanine CH3 Glycine H
tyrionpapers.com for more resources
Aspartic acid CH2COOH Serine CH2OH IB/M/Jun25/7401/1
Glutamine (CH2)2CONH2 Valine CH(CH3)2
