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22 Cards in this Set
- Front
- Back
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Biogenesis |
the production of new living organisms or organelles. the law of Biogenesis is that living things come only from other living things. by reproducion. |
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Cell theory |
A scientific theory which describes the properties of cells |
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Cells |
The smallest structural and functional unit of an organism. |
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Coating or (shadowing) |
Samples must be coated before they can be observed with a scanning electron microscope. A thin layer of gold, carbon or platinum is deposited onto the surface. |
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Compound light microscopes |
Microscopes with at least two sets of lenses. |
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Eyepiece (ocular) lenses |
The piece in which you look through to observe the specimen. Objective lens (power) times ocular lens (power). |
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fluorescence microscope |
Uses ultraviolet (UV) light to reveal compounds that have been stained with fluorescent dyes. |
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High-pressure fracturing |
Samples are frozen extremely quickly and under high pressure using a specially built, high pressure freezer. Used for observation without chemical fixation. |
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Light microscope |
Use visible light that illuminates and passes through a specimen. |
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Magnification |
Process of enlarging something only in appearance, not physical size. |
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Microscopes |
A optical instrument used to view very small objects. |
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Nucleus |
The positively charged central core of atom, consisting of protons and neutron and consisting nearly all the atoms mass. |
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Objective lens |
The amount of magnification you obtain when using a light microscope, that is, how large the object appears. |
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oil immersion objective lens |
highest magnifications are obtained. reduces the loss of light due to refraction. |
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phase contrast microscope |
Modified compound light microscope that was developed to observe unstained, intact living cells. |
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resolution |
the ability to see two points that are close together as two separate points. |
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Scanning confocal microscope |
Uses laser light and special optics to allow a viewer to look at successively deeper layers of an object. |
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Scanning electron microscope |
provides detailed images of surfaces. |
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Simple light microscopes |
Use only one glass lens. similar to magnifying glasses. |
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Spontaneous generation |
The idea that living things could arise from nonliving matter or dead matter.
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Staining |
Cells are virtually colourless and are difficult to see under microscopes. colour is added. |
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Transmission electron microscope |
A beam of electrons with a much a shorter wave length passes through and is used to illuminate electrons. Has a series of electromagnets, each of which creates an electromagnetic field to control the path of the electron beam. |
