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AS Biology Revision Guide for OCR (2008 NEW course)

Unit 1: Cells, Exchange and Transport

Module 1: Cells

Light Microscopy and Magnification

Magnification ­ is the degree to which the size of an image is larger than the
image itself. Numerically it is the image size divided by the actual…

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2. SECTIONING ­ Specimens are embedded in wax. Thin sections are then
cut without distorting the structure of the specimen. This is particularly
useful for making sections of soft tissue, such as brain.

Unit Symbol Metre Equivalent Fraction of a
Metre m 1 One
Decimetre dm 0.1 One tenth…


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