Aqa a level biology 4 Study guides, Class notes & Summaries
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AQA A Level Biology 4.pdf
- Exam (elaborations) • 27 pages • 2024
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AQA A Level Biology
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A* example of AQA A-Level Biology essay on importance of membranes, scoring 20+ marks
- Essay • 3 pages • 2023
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A marked A* example of an AQA A-level Biology essay in paper 3, containing 4 paragraphs and a mind-map essay plan on the importance of membranes in living organisms. This essay is synoptic, detailed, coherent and links back to the question, which scored 20+ marks.
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AQA A-level Biology - Topic 4 Questions and Answers 100% Solved
- Exam (elaborations) • 30 pages • 2024
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AQA A-level Biology - Topic 4 Questions 
and Answers 100% Solved 
Define variation Differences that exist between individuals 
In what ways can variation be caused? It can be caused by genetic factors, such as alleles 
from mutations. 
It can also be caused by the environment, such as climate. 
Most variation is caused by a combination of genetic factors and environmental factors 
Why is it impossible to study a whole population? Because it is too large and would take too 
long. Instead, scient...
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AQA A-level Biology - Topic 4 Questions and Answers 100% Solved
- Exam (elaborations) • 30 pages • 2024
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AQA A-level Biology - Topic 4 Questions 
and Answers 100% Solved 
Define variation Differences that exist between individuals 
In what ways can variation be caused? It can be caused by genetic factors, such as alleles 
from mutations. 
It can also be caused by the environment, such as climate. 
Most variation is caused by a combination of genetic factors and environmental factors 
Why is it impossible to study a whole population? Because it is too large and would take too 
long. Instead, scient...
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AQA A-level Biology - Topic 4 Already Passed
- Exam (elaborations) • 34 pages • 2024
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AQA A-level Biology - Topic 4 Already 
Passed 
Define variation Differences that exist between individuals 
In what ways can variation be caused? It can be caused by genetic factors, such as alleles 
from mutations. 
It can also be caused by the environment, such as climate. 
Most variation is caused by a combination of genetic factors and environmental factors 
Why is it impossible to study a whole population? Because it is too large and would take too 
long. Instead, scientists use a sample th...
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AQA A LEVEL BIOLOGY PAPER 1 2021.
- Exam (elaborations) • 41 pages • 2022
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AQA A LEVEL BIOLOGY PAPER 1 
2021. Describe the induced-fit model based on enzyme action and how an enzyme acts as a 
catalyst. 
[3 marks] 
. 2 Scientists investigated the action based on the enzyme ATP synthase. They made reaction 
mixtures each containing: 
• ATP synthase 
• buffer (to control pH) 
• substrates. 
One based on the substrates required within these reaction mixtures is inorganic phosphate (Pi). 
Tick ( ) one box to show which other substrate the scientists must add to the ...
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AQA A-level BIOLOGY 7402/2 Paper 2 Mark scheme June 2022 Version: 1.0 Final.
- Exam (elaborations) • 17 pages • 2023
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AQA A-level BIOLOGY 7402/2 Paper 2 Mark scheme June 2022 Version: 1.0 Final. MARK SCHEME – A-LEVEL BIOLOGY – 7402/2 – JUNE 2022 
2 
Mark schemes are prepared by the Lead Assessment Writer and considered, together with the relevant 
questions, by a panel of subject teachers. This mark scheme includes any amendments made at the 
standardisation events which all associates participate in and is the scheme which was used by them in 
this examination. The standardisation process ensures that th...
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AQA A-level Biology - Topic 4 Exam – Questions & Answers
- Exam (elaborations) • 16 pages • 2024
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AQA A-level Biology - Topic 4 Exam – Questions & Answers
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AQA A-level BIOLOGY 7402/3 Paper 3 Mark scheme June 2023 (VERIFIED)
- Exam (elaborations) • 28 pages • 2024
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AQA A-level BIOLOGY 7402/3 Paper 3 Mark scheme June 2023 (VERIFIED) (There are) stretch-mediated sodium ion 
channels (in the membrane); 
2. (Increased pressure) deforms/changes 
(sensory neurone/axon) membrane/lamella(e) 
OR 
(Increased pressure) deforms/changes sodium 
ion channels; 
3. Sodium ion channels open; 
4. Sodium ions diffuse in; 
5. Depolarisation (leading to generator potential); 
3 max 
(3 x 
AO1) 
1. 2. 3. or 4. Accept 
Na+ 
Max 2 if only 
reference to sodium 
and not sodium ions...
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AQA A Level Biology 4/5/6 mark questions (2022/2023) (Certified Answers)
- Exam (elaborations) • 33 pages • 2024
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Many different substances enter and leave a cell by crossing its cell surface membrane. Describe 
how substances can cross a cell surface membrane. (5) 1 (Simple / facilitated) diffusion from 
high to low 
concentration / down concentration gradient; 
2 Small / non-polar / lipid-soluble molecules pass via phospholipids / bilayer; 
OR 
Large / polar / water-soluble molecules go through proteins; 
3 Water moves by osmosis / from high water potential to low water potential / from less to more 
nega...
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