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20 Cards in this Set
- Front
- Back
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Which set of four elements makes up the largest portion of cells by dry weight?
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carbon, hydrogen, oxygen, nitrogen
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Any substance, whether in elemental or molecular form, that must be provided to an organism is called a(n)
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essential nutrient
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A micronutrient can also be called
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a trace element
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Microbial cell cytoplasm is composed mostly of
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water and protein.
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An autotroph
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uses inorganic carbon dioxide as its carbon source.
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Nitrogen is vital to microbial growth. It is obtained from organic or inorganic sources to make
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amino acids.
proteins. nucleotides. |
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A ____________ metabolizes the organic matter of dead organisms.
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saprobe
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Extracellular digestion in bacteria and fungi
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facilitates transport of nutrients in.
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When the environment is equal in solute concentration to the cell's internal environment then there is no net change in cell volume. This indicates a(n) ____________ solution around the cell.
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isotonic
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Cell walls are useful for structural integrity as well as to keep a cell from bursting in a(an) solution.
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hypotonic
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The majority of medically significant microorganisms are
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mesophiles
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An organism that is capable of living without oxygen if necessary is termed a(n)
aerobe. |
facultative anaerobe.
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Most cultured bacteria tend to multiply by
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binary fission.
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During this phase of growth, newly inoculated cells require a period of adjustment, enlargement, and synthesis.
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lag phase
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The duration of each bacterial division is called the generation or
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doubling time
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Cell numbers can be counted directly by all of the following EXCEPT
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turbidity.
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The stationary growth phase in a bacterial growth chart is due to all of the following EXCEPT
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a period of adjustment to growing conditions.
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Assuming I had a single bacterium that could undergo binary fission every minutes, how many bacteria would I have at the end of hours?
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2 to 14th power or 16384
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The optimum pH for most culturable microbes ranges between
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6-8
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Microbes in most environments form ecological associations with other organisms. The term for a symbiotic relationship
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mutualism
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