Discuss the ways in which light rays can be manipulated to increase resolution and/or contrast.
What will be an ideal response?
Light rays can be manipulated to increase the resolution and contrast of a specimen in a variety of ways. In bright-field microscopes, immersion oil is used to capture light rays that would otherwise be refracted and lost; the result is an increase in the resolution of the image. Dark-field microscopes purposely scatter light rays in such a way as to improve the contrast of the specimen. Phase-contrast microscopes alter the wavelengths of light rays by splitting them into different paths then rejoining them, thereby increasing contrast. Finally, fluorescent microscopes use UV light, which produces increased resolution because of its shorter wavelength, and the fluorescent dyes that are used emit a variety of colors, increasing contrast.
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Water and mineral ions are reabsorbed by the:
A. colon. B. small intestines. C. stomach. D. colon and small intestines. E. colon, small intestines, and stomach.
American sycamore(Platanus occidentalis) and European sycamore (Platanus orientalis) are tree species that will interbreed if planted nearby but will not normally interbreed because they occur on different continents. This is an example of
A. mechanical isolation. B. temporal isolation. C. habitat isolation. D. behavioral isolation. E. gametic isolation.
The method of nucleotide sequence determination that utilizes dideoxynucleotides was developed by ________.
Fill in the blank(s) with the appropriate word(s).
True or False: The following list is in increasing order of complexity: cell, community, guild, population, and ecosystem
a. TRUE b. FALSE