A-Level Biology AQA 7402

2.1.3: Methods of studying cells

#2.1.3.1

The principles and limitations of optical microscopes, transmission electron microscopes and scanning electron microscopes.

#2.1.3.2

Measuring the size of an object viewed with an optical microscope. The difference between magnification and resolution.

#2.1.3.3

Use of the formula: $\text{magnification}=\dfrac{\text{size of image}}{\text{size of real object}}$

#2.1.3.4

Principles of cell fractionation and ultracentrifugation as used to separate cell components.

#2.1.3.5

Students should be able to appreciate that there was a considerable period of time during which the scientific community distinguished between artefacts and cell organelles.

2.1.2

Structure of prokaryotic cells and of viruses

2.2

All cells arise from other cells

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