Fossil fuels, like oil, gas, and coal, form when organic material is preserved from the complete action of decomposers, generally buried deep and under pressure during millions of years. Under such conditions, the organic material transforms into hydrocarbon fuels.
Fossil fuels are natural reservatory of carbon. When oxygen is present, these fuels can be burned and carbon dioxide and carbon monoxide are released to the atmosphere.
Resolution is the ability of a lens to distinguish between small objects close together. What approximate resolution can be obtained with a lower power (10X, N.A. 0.25) objective lens? A) 0.2 microns B) 0.3 microns C) 0.9 microns D) 0.25
A microscope in which an image is formed by passing an electron beam through a specimen and focusing the scattered electrons with magnetic lenses is called a A) transmission electron microscope B) scanning electron microscope C) phase-contrast microscope
Living, unstained cells and organisms can be observed best using A) fluorescent microscopy B) TEM C) phase contrast microscopy
Fixation is the process by which the structures of the cells are preserved and fixed in position. An advantage of chemical fixation over heat fixation is that it A) magnifies the specimen B) does not destroy internal structures
The substage condenser A) changes the wavelength of the light reaching the specimen B) focuses light on the specimen C) decreases the amount of light reaching the specimen
A 40X objective and an 10X ocular produce a total magnification of A) 50 B) 400 C) 90
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