Microbiology Homework Chapter 8
Which of the following microbial systems can be exploited to control the growth of
microorganisms? - *answers *Microbial nutrition
The terminology used to describe different microbial control agents is important to understand
because - *answers *some treatments have different effects depending on the conditions
some of the words are in common use with imprecise meanings
Gram-negative bacteria are somewhat less susceptible to control agents than Gram-positives
because _____. - *answers *they have an outer membrane as an additional barrier
For a microbial control technique to result in sterilization, what must happen to the organisms
in an environment? - *answers *Cells, spores, and viruses must be destroyed or removed.
A chemical whose use results in the destruction of all life and infectious agents on an object is
called a(n) - *answers *sterilant
Which two of the following are effective ways to control microorganisms? - *answers
*poisoning
starvation
Which of the following best defines biocides? - *answers *Biocide describes all antimicrobials
that can be used to control microbes.
For a control treatment to be effective, the _____ of a microbe presents a permeability barrier
that must be overcome. - *answers *outer layer
When an object is totally free of viable microorganisms, spores, viruses, prions, and other
infections agents, it is said to be . - *answers *starile
,Microbiology Homework Chapter 8
Choose two phrases that describes "disinfection". - *answers *the reduction of the microbial
population
the destruction of potential pathogens
Which of the following terms describes a chemical that is used destroy all organisms (including
viruses and endospores) on an object? - *answers *Sterilant
Which type of microbial control agent are disinfectants usually? - *answers *Chemical
Sanitization results in ______. - *answers *decrease in microbial levels
Which of the following is true regarding disinfection? - *answers *Disinfection is the removal of
only pathogens from an object.
How do sterilization and disinfection differ? - *answers *A sterile object has no living cells,
spores or viruses while a disinfected object may have small numbers of these.
On which two objects would you use a disinfectant to control microbial growth? - *answers
*diaper changing table
bathroom sink
Why are antiseptics not as toxic as disinfectants? - *answers *It is important not to destroy the
tissue on which they are intended to control growth.
The process of controlling microbial growth on living tissue is called . - *answers *antisepsis
Sanitization is used on _______. - *answers *inanimate objects
, Microbiology Homework Chapter 8
Which two of the following may be found on a properly disinfected object? - *answers *small
number of microbes
viable spores
A chemical agent used to control microbial growth on living tissue is called a(n) - *answers
*antiseptic
Antiseptics and disinfectants are both chemical agents used for the control of microbial growth.
How do they compare in their toxicity to microbes? - *answers *Disinfectants are harsher
chemicals.
Antisepsis is the process of controlling microbial growth ______. - *answers *on living tissue
Growth of microbes will resume following the discontinuation of which type of treatment? -
*answers *Fungistatic
Bacteristatic
The terminology used to describe different microbial control agents is important to understand
because - *answers *some of the words are in common use with imprecise meanings
some treatments have different effects depending on the conditions
True or false: The effect of an antimicrobial treatment can be inferred from its name. The Latin
root, cida, (to kill), or the Greek root, statikos,(to stop) indicates whether a treatment will kill or
merely slow a target microbial population. - *answers *True
Upon treatment of a microbial population with a biocidal agent, after some time the rate of
killing slows. This effect is due to _______. - *answers *survival of a resistant strain
An antiseptic is which type of microbial control agent? - *answers *Chemical
Which of the following microbial systems can be exploited to control the growth of
microorganisms? - *answers *Microbial nutrition
The terminology used to describe different microbial control agents is important to understand
because - *answers *some treatments have different effects depending on the conditions
some of the words are in common use with imprecise meanings
Gram-negative bacteria are somewhat less susceptible to control agents than Gram-positives
because _____. - *answers *they have an outer membrane as an additional barrier
For a microbial control technique to result in sterilization, what must happen to the organisms
in an environment? - *answers *Cells, spores, and viruses must be destroyed or removed.
A chemical whose use results in the destruction of all life and infectious agents on an object is
called a(n) - *answers *sterilant
Which two of the following are effective ways to control microorganisms? - *answers
*poisoning
starvation
Which of the following best defines biocides? - *answers *Biocide describes all antimicrobials
that can be used to control microbes.
For a control treatment to be effective, the _____ of a microbe presents a permeability barrier
that must be overcome. - *answers *outer layer
When an object is totally free of viable microorganisms, spores, viruses, prions, and other
infections agents, it is said to be . - *answers *starile
,Microbiology Homework Chapter 8
Choose two phrases that describes "disinfection". - *answers *the reduction of the microbial
population
the destruction of potential pathogens
Which of the following terms describes a chemical that is used destroy all organisms (including
viruses and endospores) on an object? - *answers *Sterilant
Which type of microbial control agent are disinfectants usually? - *answers *Chemical
Sanitization results in ______. - *answers *decrease in microbial levels
Which of the following is true regarding disinfection? - *answers *Disinfection is the removal of
only pathogens from an object.
How do sterilization and disinfection differ? - *answers *A sterile object has no living cells,
spores or viruses while a disinfected object may have small numbers of these.
On which two objects would you use a disinfectant to control microbial growth? - *answers
*diaper changing table
bathroom sink
Why are antiseptics not as toxic as disinfectants? - *answers *It is important not to destroy the
tissue on which they are intended to control growth.
The process of controlling microbial growth on living tissue is called . - *answers *antisepsis
Sanitization is used on _______. - *answers *inanimate objects
, Microbiology Homework Chapter 8
Which two of the following may be found on a properly disinfected object? - *answers *small
number of microbes
viable spores
A chemical agent used to control microbial growth on living tissue is called a(n) - *answers
*antiseptic
Antiseptics and disinfectants are both chemical agents used for the control of microbial growth.
How do they compare in their toxicity to microbes? - *answers *Disinfectants are harsher
chemicals.
Antisepsis is the process of controlling microbial growth ______. - *answers *on living tissue
Growth of microbes will resume following the discontinuation of which type of treatment? -
*answers *Fungistatic
Bacteristatic
The terminology used to describe different microbial control agents is important to understand
because - *answers *some of the words are in common use with imprecise meanings
some treatments have different effects depending on the conditions
True or false: The effect of an antimicrobial treatment can be inferred from its name. The Latin
root, cida, (to kill), or the Greek root, statikos,(to stop) indicates whether a treatment will kill or
merely slow a target microbial population. - *answers *True
Upon treatment of a microbial population with a biocidal agent, after some time the rate of
killing slows. This effect is due to _______. - *answers *survival of a resistant strain
An antiseptic is which type of microbial control agent? - *answers *Chemical
