Practice Paper: AQA AS Biology 7401/02
(Paper 2)
Topics 1–4 with an extended response
Question paper
Written by AcePapers
Independent practice paper written for revision. Not an official AQA paper and not
affiliated with or endorsed by AQA.
Time allowed: 1 hour 30 minutes Total: 75 marks
You will need
• A pen, a pencil, a ruler and a scientific calculator.
Instructions
• Answer every question, writing your answers in the lined spaces. You may not
need all of the lines.
• Show your working in calculations and give units where they are needed.
• Question 10 is an extended response question worth 10 marks. Plan your answer
before you write it.
• The mark for each part is printed in brackets. Plan your time with it.
• Organisms and data labelled fictional, invented or illustrative were made up for
this paper.
Name: ______________________________________ Date: ________________
Practice Paper 7401/02 (Paper 2) – Question paper Written by AcePapers | Page 1
, Question 01
Water, ATP and inorganic ions are essential to living organisms.
01.1 Explain how hydrogen bonding gives water a high specific heat capacity, and
why this is important to organisms.
[2 marks]
01.2 Describe how ATP is made from ADP.
[2 marks]
01.3 Give one reason why ATP is suited to being the immediate source of energy in
cells.
[1 mark]
01.4 Name the inorganic ion that is transported with glucose into epithelial cells of
the ileum.
[1 mark]
Question 01 total: 6 marks
Question 02
Mammal M (a fictional species) lives in mountains at high altitude. Figure 1 shows
oxygen dissociation curves for the haemoglobin of humans and of Mammal M. Table
1 gives values from the human curve.
Practice Paper 7401/02 (Paper 2) – Question paper Written by AcePapers | Page 2
, Figure 1 (illustrative curves)
Partial pressure of oxygen
2 4 6 8 10 12
(kPa)
Saturation of human haemoglobin
16 57 81 90 95 97
(%)
Table 1
02.1 Explain the advantage to Mammal M of having haemoglobin with the
dissociation curve shown in Figure 1.
[2 marks]
02.2 In a human, the partial pressure of oxygen is 12 kPa in the lungs and 4 kPa in
an exercising muscle. When fully saturated, 100 cm³ of blood carries 20 cm³ of
oxygen. Use Table 1 to calculate the volume of oxygen released to the muscle
from each 100 cm³ of blood.
[2 marks]
Answer: ______________________ cm³
02.3 During exercise, the dissociation curve for human haemoglobin in the muscles
shifts to the right. Explain how this happens and why it is an advantage.
[3 marks]
Practice Paper 7401/02 (Paper 2) – Question paper Written by AcePapers | Page 3
(Paper 2)
Topics 1–4 with an extended response
Question paper
Written by AcePapers
Independent practice paper written for revision. Not an official AQA paper and not
affiliated with or endorsed by AQA.
Time allowed: 1 hour 30 minutes Total: 75 marks
You will need
• A pen, a pencil, a ruler and a scientific calculator.
Instructions
• Answer every question, writing your answers in the lined spaces. You may not
need all of the lines.
• Show your working in calculations and give units where they are needed.
• Question 10 is an extended response question worth 10 marks. Plan your answer
before you write it.
• The mark for each part is printed in brackets. Plan your time with it.
• Organisms and data labelled fictional, invented or illustrative were made up for
this paper.
Name: ______________________________________ Date: ________________
Practice Paper 7401/02 (Paper 2) – Question paper Written by AcePapers | Page 1
, Question 01
Water, ATP and inorganic ions are essential to living organisms.
01.1 Explain how hydrogen bonding gives water a high specific heat capacity, and
why this is important to organisms.
[2 marks]
01.2 Describe how ATP is made from ADP.
[2 marks]
01.3 Give one reason why ATP is suited to being the immediate source of energy in
cells.
[1 mark]
01.4 Name the inorganic ion that is transported with glucose into epithelial cells of
the ileum.
[1 mark]
Question 01 total: 6 marks
Question 02
Mammal M (a fictional species) lives in mountains at high altitude. Figure 1 shows
oxygen dissociation curves for the haemoglobin of humans and of Mammal M. Table
1 gives values from the human curve.
Practice Paper 7401/02 (Paper 2) – Question paper Written by AcePapers | Page 2
, Figure 1 (illustrative curves)
Partial pressure of oxygen
2 4 6 8 10 12
(kPa)
Saturation of human haemoglobin
16 57 81 90 95 97
(%)
Table 1
02.1 Explain the advantage to Mammal M of having haemoglobin with the
dissociation curve shown in Figure 1.
[2 marks]
02.2 In a human, the partial pressure of oxygen is 12 kPa in the lungs and 4 kPa in
an exercising muscle. When fully saturated, 100 cm³ of blood carries 20 cm³ of
oxygen. Use Table 1 to calculate the volume of oxygen released to the muscle
from each 100 cm³ of blood.
[2 marks]
Answer: ______________________ cm³
02.3 During exercise, the dissociation curve for human haemoglobin in the muscles
shifts to the right. Explain how this happens and why it is an advantage.
[3 marks]
Practice Paper 7401/02 (Paper 2) – Question paper Written by AcePapers | Page 3
