4.1a - How cells are studied
Terms in this set (8)
The study of the cell
Dimensional unit often used to measure cell size.
Micrometer (1/10,000 of a cm)
Most commonly used instruments for microscopy.
The light microscope, the transmission electron microscope, the scanning electron microscope.
Light microscope (LM)
Produces a two-dimensional image by passing visible light through the specimen. Glass lenses focus and magnify the image.
Electron microscope (EM)
Uses a beam of electron to illuminate the specimen.
Transmission electron microscope (TEM)
Directs an electron beam through a thin-cut section of the specimen onto a screen for viewing or film.
Scanning electron microscope (SEM)
An electron beam is moved across the surface of the specimen, and reflected electrons generate a surface-topography image.
What is the advantage of using a TEM instead of an LM to study intracellular structure?
The resolution of a TEM is over 1000 times higher than an LM; thus creating a more detailed image that is easier to study and understand.
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