As OCR Biology Flash Cards

Revision Cards for Unit 1 both Module 1 + 2

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  • Created by: Sheila
  • Created on: 28-11-09 09:47
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First 99 words of the document:

There are two types of microscopes: light (up to X1500
and low resolution) and electron (up to X500000 and
high resolution).
Resolution is how well small, close objects can be
seen separately. High resolution produces detailed
images of cells (ultrastructure).
Specimens need preparation to make structures visible.
Light microscopes need stains (e.g. acetic orcein for
DNA). Electron microscopes need lead salts to scatter
electrons and produce images. The pictures produced
are called micrographs.
The magnification of a micrograph is the observed
size/actual size.

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