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Chapter 3 ­ cells and movement in and out of them
AQA



Microscopes
1. Define resolution.
Minimum distance apart that two objects can be in order for them to appear as separate
objects.

2. What is the resolution of an electron microscope like and why?
Better resolution due to the…

Page 2

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Chapter 3 ­ cells and movement in and out of them
AQA



13. What are the nuclear pore function?
Allows passage of molecules

14. What is the nuclear envelope?
Double membrane that surrounds the nucleus

15. What is chromatin?
DNA in nucleoplasm

16. What is the function of the double…

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Chapter 3 ­ cells and movement in and out of them
AQA




25. Which processes are passive?
Diffusion
Facilitated diffusion
Osmosis
Co-transport



Cell Fractionation
26. What is cell fractionation?
The process of breaking apart cells and separating/isolating their organelles
27. Three stages of cell fractionation
1) Place tissue in isotonic,…

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Chapter 3 ­ cells and movement in and out of them
AQA



Phospholipids

36. Uses of lipids
Water proofing
Energy source
Insulation
Protection
Phospholipids in plasma membrane

37. Test for lipids
Emulsion test -> ethanol and water -> cloudy white emulsion

38. What are the differences between triglycerides and phospholipids…

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Chapter 3 ­ cells and movement in and out of them
AQA



43. Define diffusion
The net movement of molecules or ions from a region of high concentration to a region of
low concentration (down a conc gradient)


44. What is diffusion proportional to?
Surface area x conc diff/ diffusion…

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Chapter 3 ­ cells and movement in and out of them
AQA




52. What is an isotonic solution?
Concentration inside cells is equal to that of the solution
No net movement of water across a semi-permeable membrane (although there is
osmosis)



53. When is a plant cell described as turgid?…

Page 7

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Chapter 3 ­ cells and movement in and out of them
AQA



Osmosis
Co-transport


60. Explain how cholera bacteria works
1) Most `vibrio cholerae' bacteria are killed by stomach acid. Some may survive if pH above
4.5.
2) Propel themselves through mucus using flagella into lining of the small intestine…

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