Cell Theory and Types of Microscopes

Front

What is Cell Theory?

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Cell Theory is a fundamental concept in biology that states: 1) All living organisms are composed of one or more cells, 2) The cell is the basic unit of life, and 3) All cells arise from pre-existing cells.

Front

What type of microscope is best for viewing the surface of a specimen?

Back

Dissecting Microscope.

Front

What is the primary function of a light microscope?

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To use light and glass lenses to magnify an image.

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What is required to produce an image in an electron microscope?

Back

A vacuum.

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Which microscope is used to view internal structures of cells?

Back

Transmission Electron Microscope (TEM).

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What is the difference between a Scanning Electron Microscope (SEM) and a Transmission Electron Microscope (TEM)?

Back

SEM provides 3D images of the surface of a specimen, while TEM provides detailed images of the internal structures of a specimen.

Front

What is the maximum magnification typically achievable with a light microscope?

Back

Around 1000X.

Front

What is the role of lenses in a light microscope?

Back

Lenses focus light to magnify the image of the specimen.

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What type of specimen preparation is needed for a Transmission Electron Microscope?

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Specimens must be thinly sliced and often stained with heavy metals.

Front

What is the main advantage of using an electron microscope over a light microscope?

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Electron microscopes provide much higher resolution and magnification.