Nesters Microbiology Ch 1-4 Multiple choice Questions with Correct
Answers
A method that counts only live microbes is the
A)pure culture method.
B)plate count method.
C)cell counting method.
D)turbidity method.
E)None of these choices are correct. - correct answersB)plate count method.
Isolating a pure microbial culture from a mixed culture can be best accomplished by the
A)broth culture method.
B)streak plate method.
C)membrane filtration method.
D)multi-tube method.
E)None of these choices are correct. - correct answersB)streak plate method.
The problem with using gelatin as a solidifying agent for microbiological media is that
A)many organisms can degrade gelatin.
B)gelatin may not remain solid at temperatures required for microbial growth.
C)gelatin is not stable during sterilization procedures.
D)gelatin liquefies at warm temperatures.
E)All of these choices are correct - correct answersE)All of these choices are correct
A microorganism isolated from the Arctic region would most likely be
A)a mesophile.
B)facultative.
C)a psychrophile.
D)extremophilic.
E)a psychrotroph. - correct answersC)a psychrophile.
,A microorganism that grows in the presence of oxygen when it is available but can also grow without
oxygen is
A)microaerophilic.
B)aerobic.
C)an aerotolerant anaerobe.
D)a facultative anaerobe.
E)None of these choices are correct. - correct answersD)a facultative anaerobe.
When organisms use oxygen in aerobic respiration, helpful derivatives called reactive oxygen species
form as by-products.
A)True
B)False - correct answersB)False
Organisms that require organic compounds for a carbon and energy source are called
A)chemolithoautotrophs.
B)chemoorganoheterotrophs.
C)mesotrophs.
D)psychrotrophs.
E)aerotrophs. - correct answersB)chemoorganoheterotrophs.
Cobalt, zinc, copper and manganese are examples of _____________________________.
A)major elements
B)trace elements
C)vital proteins to a cell
D)growth factors
E)None of the above. - correct answersB)trace elements
An organism is cultured in media containing hydrogen sulfide and carbon dioxide as the only sources for
energy and carbon. This would be
, A)an enrichment media for chemoorganoheterotrophs.
B)a differential media for chemoorganoheterotrophs.
C)an enrichment media for chemolithoautotrophs.
D)a differential medium for photoheterotrophs.
E)None of these choices are correct - correct answersC)an enrichment media for chemolithoautotrophs.
Which of the following statements is FALSE?
A)Bacteria growing in log phase are least affected by antibiotics.
B)The generation time of bacteria may vary from species to species.
C)Bacteria divide by binary fission, producing two daughter cells.
D)Secondary metabolites are normally produced during late log phase.
E)In the lag phase, cells increase the number of ribosomes they contain. - correct answersA)Bacteria
growing in log phase are least affected by antibiotics.
Differential media contain an ingredient that certain microbes can change in a recognizable way.
A)True
B)False - correct answersA)True
When the number of cells in a culture increases exponentially, the phase of the culture cycle is termed
A)lag.
B)log.
C)stationary.
D)death.
E)prolonged decline. - correct answersB)log.
The growth phase in which cells are adapting to new growth conditions is termed
A)lag.
B)log.
C)stationary.
Answers
A method that counts only live microbes is the
A)pure culture method.
B)plate count method.
C)cell counting method.
D)turbidity method.
E)None of these choices are correct. - correct answersB)plate count method.
Isolating a pure microbial culture from a mixed culture can be best accomplished by the
A)broth culture method.
B)streak plate method.
C)membrane filtration method.
D)multi-tube method.
E)None of these choices are correct. - correct answersB)streak plate method.
The problem with using gelatin as a solidifying agent for microbiological media is that
A)many organisms can degrade gelatin.
B)gelatin may not remain solid at temperatures required for microbial growth.
C)gelatin is not stable during sterilization procedures.
D)gelatin liquefies at warm temperatures.
E)All of these choices are correct - correct answersE)All of these choices are correct
A microorganism isolated from the Arctic region would most likely be
A)a mesophile.
B)facultative.
C)a psychrophile.
D)extremophilic.
E)a psychrotroph. - correct answersC)a psychrophile.
,A microorganism that grows in the presence of oxygen when it is available but can also grow without
oxygen is
A)microaerophilic.
B)aerobic.
C)an aerotolerant anaerobe.
D)a facultative anaerobe.
E)None of these choices are correct. - correct answersD)a facultative anaerobe.
When organisms use oxygen in aerobic respiration, helpful derivatives called reactive oxygen species
form as by-products.
A)True
B)False - correct answersB)False
Organisms that require organic compounds for a carbon and energy source are called
A)chemolithoautotrophs.
B)chemoorganoheterotrophs.
C)mesotrophs.
D)psychrotrophs.
E)aerotrophs. - correct answersB)chemoorganoheterotrophs.
Cobalt, zinc, copper and manganese are examples of _____________________________.
A)major elements
B)trace elements
C)vital proteins to a cell
D)growth factors
E)None of the above. - correct answersB)trace elements
An organism is cultured in media containing hydrogen sulfide and carbon dioxide as the only sources for
energy and carbon. This would be
, A)an enrichment media for chemoorganoheterotrophs.
B)a differential media for chemoorganoheterotrophs.
C)an enrichment media for chemolithoautotrophs.
D)a differential medium for photoheterotrophs.
E)None of these choices are correct - correct answersC)an enrichment media for chemolithoautotrophs.
Which of the following statements is FALSE?
A)Bacteria growing in log phase are least affected by antibiotics.
B)The generation time of bacteria may vary from species to species.
C)Bacteria divide by binary fission, producing two daughter cells.
D)Secondary metabolites are normally produced during late log phase.
E)In the lag phase, cells increase the number of ribosomes they contain. - correct answersA)Bacteria
growing in log phase are least affected by antibiotics.
Differential media contain an ingredient that certain microbes can change in a recognizable way.
A)True
B)False - correct answersA)True
When the number of cells in a culture increases exponentially, the phase of the culture cycle is termed
A)lag.
B)log.
C)stationary.
D)death.
E)prolonged decline. - correct answersB)log.
The growth phase in which cells are adapting to new growth conditions is termed
A)lag.
B)log.
C)stationary.
