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...
Summary Biology For Aqa Student Book - Unit 1 - Protein structure
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A/AS Level
AQA
A Level Biology
Unit 2 - Cells
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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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