1007047517-AQA-Biology-Organisation-GraspIT-GCSE-ANSWERS
1007047517-AQA-Biology-Organisation-GraspIT-GCSE-ANSWERS.pdf
: Questions and Answers 3/7/2026
GraspIT – AQA GCSE Organisation Questions
A. Principles of organisation
1. Describe the levels of organisation in the human circulatory system in size order from the smallest part.
(4)
Muscle Cell – can contract and respiration occurs here
Muscle (cardiac) tissue – Group of muscle cells working together to contract and respire
(cardiac muscle does not fatigue)
Heart (organ) – muscle, valves and blood vessels, puts blood under pressure
Circulatory system – Heart, blood and blood vessels working together to pump blood around
the body.
B. Animal tissues, organs and organ systems Part 1
1. Explain why enzymes are needed in digestion. (4)
Biological catalysts
Breakdown large insoluble molecules (in food)
Into small soluble molecules
That can be absorbed into the blood
2. Explain how the release of bile into the small intestines increases the rate of fat breakdown. (3)
Neutralise acid
Maintain optimum pH
For lipase enzyme
Emulsifies fats to reduce surface area
© Copyright The PiXL Club Ltd, 2017
1007047517-AQA-Biology-Organisation-GraspIT-GCSE-ANSWERS.pdf
1007047517-AQA-Biology-Organisation-GraspIT-GCSE-ANSWERS.pdf 3/7/2026, 7:45:28 PM
, 1007047517-AQA-Biology-Organisation-GraspIT-GCSE-ANSWERS
1007047517-AQA-Biology-Organisation-GraspIT-GCSE-ANSWERS.pdf
: Questions and Answers 3/7/2026
GraspIT – AQA GCSE Organisation Questions
3. Different enzymes work best at different temperatures.
The graph shows the effect of temperature on different enzymes.
a. Describe and explain the shape of the graph for enzyme A. (4)
Description:
Rate is (initially) slow
Rate increases as temperature increases up to 40oC
Rate declines to return to 0
Use of data
Explanation:
Low (kinetic) energy initially
Fewer/lower energy collisions
Optimum rate reached when there is the maximum number of (successful) collisions and all
active sites are being used
Rate falls due to enzymes denaturing
b. Enzyme B is protease and is produced in the stomach, pancreas and small intestine.
Explain why protease works more effectively in the stomach. (3)
Stomach contains acid
Acid is low pH (pH2)
pH provides optimum conditions for protease enzyme
© Copyright The PiXL Club Ltd, 2017
1007047517-AQA-Biology-Organisation-GraspIT-GCSE-ANSWERS.pdf
1007047517-AQA-Biology-Organisation-GraspIT-GCSE-ANSWERS.pdf 3/7/2026, 7:45:28 PM
1007047517-AQA-Biology-Organisation-GraspIT-GCSE-ANSWERS.pdf
: Questions and Answers 3/7/2026
GraspIT – AQA GCSE Organisation Questions
A. Principles of organisation
1. Describe the levels of organisation in the human circulatory system in size order from the smallest part.
(4)
Muscle Cell – can contract and respiration occurs here
Muscle (cardiac) tissue – Group of muscle cells working together to contract and respire
(cardiac muscle does not fatigue)
Heart (organ) – muscle, valves and blood vessels, puts blood under pressure
Circulatory system – Heart, blood and blood vessels working together to pump blood around
the body.
B. Animal tissues, organs and organ systems Part 1
1. Explain why enzymes are needed in digestion. (4)
Biological catalysts
Breakdown large insoluble molecules (in food)
Into small soluble molecules
That can be absorbed into the blood
2. Explain how the release of bile into the small intestines increases the rate of fat breakdown. (3)
Neutralise acid
Maintain optimum pH
For lipase enzyme
Emulsifies fats to reduce surface area
© Copyright The PiXL Club Ltd, 2017
1007047517-AQA-Biology-Organisation-GraspIT-GCSE-ANSWERS.pdf
1007047517-AQA-Biology-Organisation-GraspIT-GCSE-ANSWERS.pdf 3/7/2026, 7:45:28 PM
, 1007047517-AQA-Biology-Organisation-GraspIT-GCSE-ANSWERS
1007047517-AQA-Biology-Organisation-GraspIT-GCSE-ANSWERS.pdf
: Questions and Answers 3/7/2026
GraspIT – AQA GCSE Organisation Questions
3. Different enzymes work best at different temperatures.
The graph shows the effect of temperature on different enzymes.
a. Describe and explain the shape of the graph for enzyme A. (4)
Description:
Rate is (initially) slow
Rate increases as temperature increases up to 40oC
Rate declines to return to 0
Use of data
Explanation:
Low (kinetic) energy initially
Fewer/lower energy collisions
Optimum rate reached when there is the maximum number of (successful) collisions and all
active sites are being used
Rate falls due to enzymes denaturing
b. Enzyme B is protease and is produced in the stomach, pancreas and small intestine.
Explain why protease works more effectively in the stomach. (3)
Stomach contains acid
Acid is low pH (pH2)
pH provides optimum conditions for protease enzyme
© Copyright The PiXL Club Ltd, 2017
1007047517-AQA-Biology-Organisation-GraspIT-GCSE-ANSWERS.pdf
1007047517-AQA-Biology-Organisation-GraspIT-GCSE-ANSWERS.pdf 3/7/2026, 7:45:28 PM
