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Summary Topic 1 - Foundations of biology Revision cards

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Ann Fullick, Jo Locke A Level Biology A for OCR Student Book

Edition:september 2015
ISBN:9780198351924
Edition:1

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Study Level: A/AS Level
Examinator: OCR
Subject: Biology A
Unit: Unit 1

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Summarized whole book?: No
Which chapters are summarized?: Unknown
Uploaded on: March 3, 2023
Number of pages: 152
Written in: 2022/2023
Type: Summary

Subjects

biology
ocr
a level
chemistry
revision
cards

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,
,
,
,
,
,
, Microscopes produce magnified images of objects. Light microscopes use a
visible light beam (400nm-700nm) to produce a 2D photomicrograph.

Resolution in light
microscopes is 200nm, Eyepiece
so a ribosome (20nm)
is not distinguishable.
Magnification is 1500- Objective lens
2000x.

Light microscopes are: Stage
• Cheap
• Easy to use
• Portable
• Able to view living Fine focus
specimens knob

Total magnlfication = Objectiv
e lens magnification x eyep
iece lens magnification

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