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Summary Ch 3 Cell Structure notes A* AQA A Level Biology £4.49   Add to cart

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Summary Ch 3 Cell Structure notes A* AQA A Level Biology

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A set of thorough and concise notes created and used by an A* grade student to revise Cell Structure (ch 3 from the A Level AQA Biology course). The notes are detailed and clearly explain the topic by breaking each process down into steps. It includes clear and detailed diagrams and includes all co...

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  • Ch 3 cell structure
  • May 28, 2022
  • 70
  • 2020/2021
  • Summary
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3.1 Methods of
studying cells

,Magnification
• Object –
sample under
microscope

,Resolution
• Minimum distance apart 2 objects can be to appear as separate
• Light – 0.2um
• TEM – 0.1nm
• SEM – 10nm
• Up until max resolution, increasing magnification shows detail but
then it is blurry

, Cell fractionation
• Cells are broken up and organelles are separated
• Before fractionation, cells are in a cold, buffered, isotonic solution

• Cold – reduce enzyme activity so organelles are whole
• Buffered – stops pH changes
• Isotonic – prevent bursting/shrinking due to osmosis

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