2025 AQA A-LEVEL BIOLOGY Paper 2 Question Paper & Mark Scheme (Merged)
Friday 13 June 2025 [VERIFIED]
, 2
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0 1 . 1 In the following passage, the numbered spaces can be filled with biological terms.
Glycolysis is the first stage of respiration. It occurs in the (1) of cells and is
an anaerobic process. Glycolysis involves the (2) of glucose to glucose
phosphate, using ATP. The oxidation of triose phosphate to (3) results in
the net gain of ATP and reduced (4) .
Write the correct biological term beside each number below that matches the space in the
passage.
[2 marks]
1
2
3
4
0 1 . 2 The equation for the aerobic respiration of glucose is:
C6H12O6 + 6 O2 6 CO2 + 6 H2O
Six carbon dioxide molecules are produced from each glucose molecule.
Use your knowledge of the link reaction and Krebs cycle to explain why.
[2 marks]
IB/M/Jun25/7402/2
, 3
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0 1 . 3 An inhibitor of the electron transfer chain was added to aerobically respiring yeast box
cells.
As aerobic respiration was inhibited, the following changes occurred:
oxygen uptake decreased
ATP production decreased
ethanol was produced.
Explain the changes in the yeast cells following the addition of the inhibitor.
[3 marks]
Oxygen uptake decreased
ATP production decreased
Ethanol was produced
7
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IB/M/Jun25/7402/2
, 4
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outside the
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IB/M/Jun25/7402/2
Friday 13 June 2025 [VERIFIED]
, 2
Do not write
outside the
Answer all questions in the spaces provided. box
0 1 . 1 In the following passage, the numbered spaces can be filled with biological terms.
Glycolysis is the first stage of respiration. It occurs in the (1) of cells and is
an anaerobic process. Glycolysis involves the (2) of glucose to glucose
phosphate, using ATP. The oxidation of triose phosphate to (3) results in
the net gain of ATP and reduced (4) .
Write the correct biological term beside each number below that matches the space in the
passage.
[2 marks]
1
2
3
4
0 1 . 2 The equation for the aerobic respiration of glucose is:
C6H12O6 + 6 O2 6 CO2 + 6 H2O
Six carbon dioxide molecules are produced from each glucose molecule.
Use your knowledge of the link reaction and Krebs cycle to explain why.
[2 marks]
IB/M/Jun25/7402/2
, 3
Do not write
outside the
0 1 . 3 An inhibitor of the electron transfer chain was added to aerobically respiring yeast box
cells.
As aerobic respiration was inhibited, the following changes occurred:
oxygen uptake decreased
ATP production decreased
ethanol was produced.
Explain the changes in the yeast cells following the addition of the inhibitor.
[3 marks]
Oxygen uptake decreased
ATP production decreased
Ethanol was produced
7
Turn over for the next question
IB/M/Jun25/7402/2
, 4
Do not write
outside the
Turn over ►
IB/M/Jun25/7402/2
