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Summary full notes to unit 1 topic 3 alevel biology
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WJEC & Eduqas NotesMembrane Structure &
Transport
WJEC Unit 1
Eduqas Core Concepts
STUDY CHECKLIST AND ASSESSMENT
OBJECTIVES
,Instructions
Regular revision throughout the year is essential. It’s vital you keep a track of what you
understand and what you don’t understand. This booklet is designed to help you do this.
Use the following key to note how well you understand the work after your revision. Put the
letter R, A or G in the table. If you place an R or an A then you should make a note of what
you are struggling with and the end of this book under the relevant section and seek help
with this.
Key
R = Red. I am not confident about my knowledge and understanding
A = Amber. I am fairly confident about my knowledge and understanding
G = green. I am very confident about my knowledge and understanding
The following points are your Learning objectives
Cell Membrane Structure and Transport
Cell Membrane Structure
, 1. Can you draw and fully label the cell membrane as shown by the fluid mosaic model.
2. Can you explain why the cell membrane is described as the fluid mosaic model.
3. Do you know the thickness of the cell membrane?
4. Can you explain the functions of all the components of the cell membrane?
5. Can you describe the function of the cell membrane?
6. Can you name the scientists that first described the fluid mosaic model of cell membrane structure?
Membrane Transport
7. Can you define: Diffusion, Facilitated Diffusion, Active Transport and Osmosis.
8. Can you relate the structure of the cell membrane to the transport of polar and non-polar substances.
9. Can you name specific substances that are polar and non-polar?
10. Can you state other names that mean polar and non-polar?
11. Can you calculate rate and the percentage change of rate from a graph?
Diffusion
12. Can you state the factors that affect the rate of diffusion?
13. Can you relate the structure of the cell membrane to the size and lipid solubility of the substances
passing through the cell membrane to the rate of diffusion?
14. Can you recognise a graph that shows diffusion occurring?
Facilitated Diffusion
15. Can you state the factors that affect the rate of facilitated diffusion.
16. Can you relate the structure of the cell membrane to the facilitated diffusion.
17. Can you recognise a graph showing facilitated diffusion.
18. Do you understand the term saturation effect and where this occurs on a graph?
19. an you draw a diagram to show facilitated diffusion occurring.
.3
Active Transport
20. Can you state the conditions needed for active transport to occur?
21. Can you relate the structure of the cell membrane to active transport?
, 22. Can you recognise a graph showing active transport?
23. Can you recognise the keys in a question that tells you it’s about active transport.
24. Can you recognise a graph showing active transport?
25. Can you draw a diagram showing active transport?
26. Do you know how the Na+/K+ pump works and its importance to cellular function?
Osmosis
27. Do you understand the terms: Water Potential, Solute Potential and Pressure Potential?
28. Can you use the equation: ψw = ψs + ψp
29. Do you understand the terms: Isotonic, Hypotonic and hypertonic?
30. Can you describe and explain the effects of osmosis on animal cells, e.g. a red blood cell.
31. Can you use the terms in point 9.3 in relation to osmosis in animal cells.
32. Can you draw a red blood cell to show the effects of an isotonic, hypotonic and hypertonic solution.
33. Do you know what haemolysis and crenation is in animal cells. Do you know other words that could b
used instead of crenation.
34. Can you describe the effects of an isotonic, hypertonic, and hypotonic solution in plant cells.
35. Do you understand the terms: turgid, plasmolysed and incipient plasmolysis in relation to plant cells.
36. Do you know the important relationships between ψw, ψs and ψp when a plant cell is plasmolysed,
turgid and in incipient plasmolysis.
37. Can you use/plot a graph to explain the percentage change in mass that occurs in plant cells during
osmosis when the external sugar concentration is increased.
38. From the graph in 37 can you determine the sugar concentration that would produce no net moveme
of osmosis.
39. Can you use/plot a graph to explain the percentage plasmolysed plant cells that occur when the exte
sugar concentration is increased. From this graph can you determine the solute potential of the plant
cell.
40. Do you understand the importance of 50% plasmolysed cells from the graph in point 42.
41. Do you understand these important relationship in plant osmosis: 1 ψp = 0 so ψs=
ψw. 42. 2 ψw = 0 so ψs= ψp
Endocytosis, Phagocytosis, Exocytosis and Pinocytosis
43. Can you draw diagrams to show endocytosis and exocytosis?
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