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The growth of a population is an increase in the __ _ __
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Number of cells
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The requirements for microbial growth are both __ and __
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Physical and chemical
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On the basis of preferred temperature ranges, microbes are classified as __ (cold-loving), __ (moderate-temperature–loving), and__(heat-loving).
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Psychrophiles
mesophiles
thermophiles
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The_growth temperature is the lowest temperature at which a species will grow,
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Minimum
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The_growth temperature is the temperature at which it grows best
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Optimum
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And the_growth temperature is the highest temperature at which growth is possible
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Maximum
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Most bacteria grow best at a pH value between __ and __
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6.5 and 7.5.
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In a __ solution, most microbes undergo plasmolysis; halophiles can tolerate high salt concentrations.
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Hypertonic
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All organisms require a carbon source; __ use an organic molecule, and __ typically use carbon dioxide.
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Chemoheterotrophs
autotrophs
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__ is needed for protein and nucleic acid synthesis.
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Nitrogen
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Nitrogen can be obtained from the decomposition of proteins or from __ or__; a few bacteria are capable of nitrogen (N2) fixation.
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NH4+or NO3–
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Microbes that grow and multiply in or on a culture medium are known as a __.
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Culture
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Aerobes, facultative anaerobes, and aerotolerant anaerobes must have the enzymes __and either __ or __
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Superoxide dismutase
catalase
peroxidase
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Other chemicals required for microbial growth include __,__ trace elements, and, for some microorganisms, organic growth factors
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Sulfur, phosphorus,
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A _ _is any material prepared for the growth of bacteria in a laboratory
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Culture medium
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