PMT
Please write clearly in block capitals.
Centre number Candidate number
Surname
Forename(s)
Candidate signatu re
I declare this is my own work.
AS
BÎOLOGY
Paper 2
Thursday 25 May 2026 Mornîng Tîme allowed: 1 hour 30 mînutes
Materîals
For thîs paper you must have: For Examiner’s Use
• a ruler wîth mîllîmetre measurements
Question Mark
• a scîentîfîc calculator.
1
Înstructîons 2
• Use black înk or black ball-poînt pen. 3
• Fîll în the boxes at the top of thîs page.
4
• Answer all questîons.
• You must answer the questîons în the spaces provîded. Do not wrîte 5
outsîde the box around each page or on blank pages. 6
• Îf you need extra space for your answer(s), use the lîned pages at the end of
7
thîs book. Wrîte the questîon number agaînst your answer(s).
• Show all your workîng. 8
• Do all rough work în thîs book. Cross through any work you do not want 9
to be marked. 10
Înformatîon TOTAL
• The marks for the questîons are shown în brackets.
• The maxîmum mark for thîs paper îs 75.
ÎB/M/Jun23/E9 7401/2
, PMT
2
Do not write
outside the
Answer all questîons în the spaces provîded. box
0 1 . 1 Whîch statement about the functîon of rîbosomes îs correct?
Tîck (✓) one box.
[1 mark]
Sîte of transcrîptîon, catalyse the joînîng of amîno acîds by
hydrolysîs reactîons
Sîte of transcrîptîon, catalyse the joînîng of nucleotîdes by
condensatîon reactîons
Sîte of translatîon, catalyse the joînîng of amîno acîds by
condensatîon reactîons
Sîte of translatîon, catalyse the joînîng of nucleotîdes by hydrolysîs
reactîons
0 1 . 2 Name two bîologîcal molecules that can be coded for by a gene.
Do not înclude a polypeptîde or proteîn în your answer.
[1 mark]
1
2
IB/M/Jun23/7401/2
, PMT
3
Do not write
outside the
0 1 . 3 Scîentîsts învestîgated the structure of the endoplasmîc retîculum. box
Table 1 shows some of the scîentîsts’ results.
Table 1
Percentage of endoplasmîc
Type of endoplasmîc retîculum
retîculum made of phospholîpîds
Rough 46.8
Smooth 52.5
Use the data în Table 1 to suggest how the structure of rough endoplasmîc retîculum
îs dîfferent from the structure of smooth endoplasmîc retîculum and how thîs îs
related to theîr functîons.
[3 marks]
5
Turn over for the next questîon
Turn over ►
IB/M/Jun23/7401/2
, PMT
4
Do not write
outside the
0 2 . 1 Fîgure 1 shows an ATP synthase enzyme în the înner mîtochondrîal membrane. box
Fîgure 1
Complete the passage wîth the approprîate terms.
[2 marks]
ATP synthase comprîses several polypeptîdes, so îs saîd to have
a structure.
Ît catalyses the synthesîs of an ATP molecule by a
reactîon; thîs învolves the of a water molecule.
The ATP synthase în Fîgure 1 îs în a mîtochondrîon so would catalyse reactîons
durîng .
IB/M/Jun23/7401/2
Please write clearly in block capitals.
Centre number Candidate number
Surname
Forename(s)
Candidate signatu re
I declare this is my own work.
AS
BÎOLOGY
Paper 2
Thursday 25 May 2026 Mornîng Tîme allowed: 1 hour 30 mînutes
Materîals
For thîs paper you must have: For Examiner’s Use
• a ruler wîth mîllîmetre measurements
Question Mark
• a scîentîfîc calculator.
1
Înstructîons 2
• Use black înk or black ball-poînt pen. 3
• Fîll în the boxes at the top of thîs page.
4
• Answer all questîons.
• You must answer the questîons în the spaces provîded. Do not wrîte 5
outsîde the box around each page or on blank pages. 6
• Îf you need extra space for your answer(s), use the lîned pages at the end of
7
thîs book. Wrîte the questîon number agaînst your answer(s).
• Show all your workîng. 8
• Do all rough work în thîs book. Cross through any work you do not want 9
to be marked. 10
Înformatîon TOTAL
• The marks for the questîons are shown în brackets.
• The maxîmum mark for thîs paper îs 75.
ÎB/M/Jun23/E9 7401/2
, PMT
2
Do not write
outside the
Answer all questîons în the spaces provîded. box
0 1 . 1 Whîch statement about the functîon of rîbosomes îs correct?
Tîck (✓) one box.
[1 mark]
Sîte of transcrîptîon, catalyse the joînîng of amîno acîds by
hydrolysîs reactîons
Sîte of transcrîptîon, catalyse the joînîng of nucleotîdes by
condensatîon reactîons
Sîte of translatîon, catalyse the joînîng of amîno acîds by
condensatîon reactîons
Sîte of translatîon, catalyse the joînîng of nucleotîdes by hydrolysîs
reactîons
0 1 . 2 Name two bîologîcal molecules that can be coded for by a gene.
Do not înclude a polypeptîde or proteîn în your answer.
[1 mark]
1
2
IB/M/Jun23/7401/2
, PMT
3
Do not write
outside the
0 1 . 3 Scîentîsts învestîgated the structure of the endoplasmîc retîculum. box
Table 1 shows some of the scîentîsts’ results.
Table 1
Percentage of endoplasmîc
Type of endoplasmîc retîculum
retîculum made of phospholîpîds
Rough 46.8
Smooth 52.5
Use the data în Table 1 to suggest how the structure of rough endoplasmîc retîculum
îs dîfferent from the structure of smooth endoplasmîc retîculum and how thîs îs
related to theîr functîons.
[3 marks]
5
Turn over for the next questîon
Turn over ►
IB/M/Jun23/7401/2
, PMT
4
Do not write
outside the
0 2 . 1 Fîgure 1 shows an ATP synthase enzyme în the înner mîtochondrîal membrane. box
Fîgure 1
Complete the passage wîth the approprîate terms.
[2 marks]
ATP synthase comprîses several polypeptîdes, so îs saîd to have
a structure.
Ît catalyses the synthesîs of an ATP molecule by a
reactîon; thîs învolves the of a water molecule.
The ATP synthase în Fîgure 1 îs în a mîtochondrîon so would catalyse reactîons
durîng .
IB/M/Jun23/7401/2
