Aqa a level biology cells - Study guides, Class notes & Summaries
Looking for the best study guides, study notes and summaries about Aqa a level biology cells? On this page you'll find 467 study documents about Aqa a level biology cells.
Page 3 out of 467 results
Sort by
-
AQA A-Level Biology. 3.2 – Cells All Answers Correct
- Exam (elaborations) • 30 pages • 2024
-
- $11.49
- + learn more
AQA A-Level Biology. 3.2 – Cells All Answers Correct 
Structure of Nucleus. 
1. Nuclear envelope: double membrane surrounding nucleus, outer 
membrane continuous with the (R)ER of the cell. 
2. Nuclear pores: allow the passage of larger molecules, such as mRNA, out of the nucleus. 
3. Nucleoplasm: granular, jelly-like material making up the bulk of the nucleus. 
4. Chromosomes: protein-bound, linear DNA. 
5. Nucleolus: small spherical region(s) in nucleoplasm. Manufactures ribosomal RN...
-
AQA A-Level Biology - Topic 3 Questions and Answers 100% Solved
- Exam (elaborations) • 20 pages • 2024
- Available in package deal
-
- $14.99
- + learn more
AQA A-Level Biology - Topic 3 Questions 
and Answers 100% Solved 
Smaller organisms have a ........... surface area to volume ratio Higher 
How do single called organisms exchange substances? Diffuse directly into or out of the cell 
across the cell surface membrane 
Give 2 reasons why in multicellular organisms, diffusion across outer membrane would be too 
slow? 1. Some cells deep within body- big distance between them and outside 
2. Larger animals have low surface area to volume ratio- dif...
-
AQA A level BIOLOGY 7402/3 Paper 3 Mark scheme June 2023.
- Exam (elaborations) • 28 pages • 2024
-
- $13.99
- + learn more
AQA A level BIOLOGY 7402/3 Paper 3 Mark scheme June 2023. (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 
4. Accep...
-
AQA A-level BIOLOGY 7402/3 Paper 3 Mark scheme June 2023 | VERIFIED.
- Exam (elaborations) • 28 pages • 2024
-
- $12.49
- + learn more
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 ion...
-
AQA A-level Biology Paper 1 Test || All Questions & Answers (100% Correct)
- Exam (elaborations) • 15 pages • 2024
-
Available in package deal
-
- $12.00
- + learn more
AQA A-level Biology Paper 1 Test || All Questions & Answers (100% Correct) 
AQA A-level Biology Paper 1 Test || All Questions & Answers (100% Correct) 
 
large molecules often contain carbon. why? - ANSWER - they can readily form bonds with other carbon atoms. this forms a 'backbone'. other atoms can then attach. 
 
describe benedicts test for reducing sugars - ANSWER - add equal volumes of the sugar sample and benedicts reagent. 
heat the mixture in a water bath for 5 minutes. 
brick red prec...
Make study stress less painful
-
Biology AQA A level common questions latest 2023 with complete solutions
- Exam (elaborations) • 37 pages • 2024
- Available in package deal
-
- $10.08
- + learn more
Biology AQA A level common questions 
latest 2023 with complete solutions 
give two factors other than age and gender that would affect the concentration of creatinine in the 
blood ? muscle/ body mass 
ethnicity 
Explain how the cells of the collecting duct are able to absorb water from the filtrate through the 
protein channels in their plasma membranes? lower w.p/ more negative inside tubule cells so 
h2o enters by osmosis 
Suggest why diabetes insipidus is more common in males ? Bc males onl...
-
AQA A-level BIOLOGY 7402/3 Paper 3 Mark scheme June 2023
- Exam (elaborations) • 28 pages • 2024
-
- $12.99
- + learn more
AQA A-level BIOLOGY 7402/3 Paper 3 Mark scheme June 2023. (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 
4. Accep...
-
AQA A-Level Biology Topic 3 Already Passed
- Exam (elaborations) • 30 pages • 2024
- Available in package deal
-
- $10.08
- + learn more
AQA A-Level Biology Topic 3 Already 
Passed 
Why are Microorganisms able to perform exchange via their surface? • have a large surface 
area to volume ratio 
• have a short diffusion distance 
• have low demand 
How do Microorganisms Obtain Nutrients & Remove Waste? • by exchange via their surface 
• nutrients (e.g. glucose, oxygen) move in by diffusion via their surface 
• waste (e.g. carbon dioxide) move out by diffusion via their surface 
Why can't Animals/Plants perform exchange...
-
AQA A-Level Biology - Topic 3 (2022/2023) with Verified Answers
- Exam (elaborations) • 23 pages • 2024
- Available in package deal
-
- $10.08
- + learn more
AQA A-Level Biology - Topic 3 
(2022/2023) with Verified Answers 
Smaller organisms have a ........... surface area to volume ratio Higher 
How do single called organisms exchange substances? Diffuse directly into or out of the cell 
across the cell surface membrane 
Give 2 reasons why in multicellular organisms, diffusion across outer membrane would be too 
slow? 1. Some cells deep within body- big distance between them and outside 
2. Larger animals have low surface area to volume ratio- diffi...
-
AQA A LEVEL BIOLOGY 4/5/6 MARK EXAM | QUESTIONS & 100% CORRECT ANSWERS (VERIFIED) | LATEST UPDATE | GRADEA+
- Exam (elaborations) • 29 pages • 2024
- Available in package deal
-
- $10.99
- + learn more
AQA A LEVEL BIOLOGY 4/5/6 MARK 
EXAM | QUESTIONS & 100% CORRECT 
ANSWERS (VERIFIED) | LATEST UPDATE | 
GRADEA+ 
Many different substances enter and leave a cell by crossing its cell surface membrane. 
Describe how substances can cross a cell surface membrane. (5) 
Correct Answer: 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 ...
Study stress? For sellers on Stuvia, these are actually golden times. KA-CHING! Earn from your study resources too and start uploading now. Discover all about earning on Stuvia