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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 content from ch 3 of the AQA A Level Biology specification and textbook.

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Institution
AQA
Module
Unit 2 - Cells











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Connected book

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Glenn Toole, Susan Toole AQA Biology A Level Year 2 Student Book
  • januari 2015
  • 9780198351764
  • 1

Written for

Study Level
A/AS Level
Examinator
AQA
Subject
A Level Biology
Unit
Unit 2 - Cells
All documents for this subject (323)

Document information

Summarized whole book?
No
Which chapters are summarized?
Ch 3 cell structure
Uploaded on
May 28, 2022
Number of pages
70
Written in
2020/2021
Type
Summary

Subjects

Content preview

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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