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15 Cards in this Set
- Front
- Back
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To speed up the growth rate in a chemostat, the ________ should beincreased. To increase the cell yield as well, ________ should be increased. |
dilution rate / limiting nutrient |
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Maintaining a constant cell population in a chemostat requires themonitoring and control of: |
the population's by-products nutrient concentrations the dilution rate of volume pumped in |
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Which of those listed belowis NOT classified as a cardinal temperature? |
lethal temperature |
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Why are the pour-plate andspread-plate techniques to enumerate cells OFTEN favored over traditionalmicroscopy cell counting in today's microbiology laboratories? |
Only viable cells are counted |
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What happens when a culture is incubated above the organism'smaximum temperature for growth? |
The cell membranes collapse, proteins denature,and the cell usually dies. |
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Microorganisms that grow under very hot or very cold conditions. |
Extremophiles |
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The amount of time requiredfor a 10-fold reduction in the viability of a microbial population at a giventemperature is referred to as the |
decimal reduction time |
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Which type of microorganismwould NOT be able to grow under anoxic conditions? |
microaerophile |
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Organisms that have a specific requirement for sodium chloride andgrow best at reduced water potential are: |
Halophiles |
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A __________ agent is used to kill bacterial cells, where a __________ agent isused to lyse bacterial cells. |
bacteriocidal;bacteriolytic |
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A plaque assay uses the ________ technique. |
agar overlay |
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A host cell that allows the complete replicationcycle of a virus to occur is referred to as: |
a permissive cell |
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When there is a delay between viral entrance and lytic events, the phenomenon is referred to as: |
latent infection |
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The term ________ is used to referenceconcentrations of viruses. |
titer |
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How is a virion distinguished from a virus? |
Virions are always outside the host |
