Compare and contrast the light microscope with the electron microscope
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Both the light microscope and the electron microscope depend on the wavelength of radiation to achieve the resolution necessary to see fine details of specimens. Light microscopes use light rays, which, because of their relatively long wavelengths, limit the magnification of these microscopes to 2000× or less. Electron beams, by contrast, have such a short wavelength that the resolution is greatly increased, to the point that magnification of 100,000× or more is possible. Both microscopes are capable of modulating and focusing their radiation sources in such a way as to increase the quality of the magnification; however, in a light microscope the light rays are focused using glass lenses, whereas in an electron microscope the electron beam is focused with magnetic fields. Because of their higher levels of magnification and extreme resolving power, electron microscopes are capable of revealing the finest details of the cell's ultrastructure, even molecules and atoms; light microscopes are capable of revealing only the larger cellular structures, such as organelles.
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If you wanted a grass plant to bend to the right, where would you want to apply auxin?
A. on the left side of the tip of the grass B. on the left side of the grass, a few centimeters down from the tip C. on the right side of the grass, a few centimeters down from the tip D. on the right side of the tip of the grass
Which statement about the geologic time scale is
incorrect? a. Mammals originated early in the Mesozoic era. b. Adaptive radiation of flowering plants, insects, and birds took place during the Mesozoic era. c. Mass extinction of the dinosaurs occurred about 65 million years ago. d. Reptiles originated during the Paleozoic era. e. Eukaryotes originated during the Proterozoic eon.
Equilibrium is sensed by ____.
A. chemoreceptors B. mechanoreceptors C. photoreceptors D. thermoreceptors E. nociceptors
Genome
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