Prescott's Microbiology Ch. 8 Questions with
Correctly Detailed Answers Graded A+
Which of the following inhibits bacterial growth but does not kill bacteria? - Answer Bacteriostatic agent
When antiseptics and disinfectants are compared, antiseptics are generally - Answer less toxic.
An agent that specifically kills fungi but not other kinds of microorganisms is also known as a - Answer
fungicidal agent.
Sterilization involves _____________ all viable microorganisms. - Answer killing OR removing
A(n) _________ is a chemical that can be used to sterilize materials. - Answer sterilant
All germicides are capable of killing all pathogenic organisms and endospores. - Answer False
An agent that kills bacteria is referred to as __________. - Answer bactericidal
An agent that prevents the growth of bacteria without causing irreversible damage to the bacteria is
referred to as __________. - Answer bacteriostatic
The destruction or removal of all viable organisms is called - Answer sterilization.
The reduction of the microbial population to levels that are considered safe by public health standards is
called - Answer sanitization.
The prevention of infection caused by microorganisms is called - Answer antisepsis.
The substantial reduction of the total population of microorganisms on inanimate objects and the
destruction of potential pathogens is called - Answer disinfection.
, Which of the following represents the best definition of microbial death? - Answer The organism will not
grow on a medium that normally supports its growth.
Time required to kill 90% of microorganisms or spores in a sample at a specified temperature is the -
Answer decimal reduction time (D value).
The rate of killing by an antimicrobial agent may slow when the microbial population has been greatly
reduced because the remaining population may have a high proportion of resistant organisms. - Answer
True
Which of the following influence(s) the efficiency of an antimicrobial agent? - Answer All of the choices
are correct.
Larger populations generally are killed as rapidly as smaller populations. - Answer False
Which will require a longer time to kill? - Answer a larger population of microorganisms
Microorganisms show differential sensitivity to antimicrobial agents. - Answer True
Which of the following environmental factors generally do(es) not have an impact on the efficiency of an
antimicrobial agent? - Answer refractive index
Which of the following is not a method of heat sterilization? - Answer Pasteurization
Which of the following is MOST effective against resistant endospores? - Answer Autoclaving
Which of the following lacks sufficient penetrating power for bulk sterilization? - Answer Ultraviolet (UV)
radiation at 260 nm
Moist heat sterilization at 1000 kills all of the following EXCEPT - Answer bacterial endospores.
Correctly Detailed Answers Graded A+
Which of the following inhibits bacterial growth but does not kill bacteria? - Answer Bacteriostatic agent
When antiseptics and disinfectants are compared, antiseptics are generally - Answer less toxic.
An agent that specifically kills fungi but not other kinds of microorganisms is also known as a - Answer
fungicidal agent.
Sterilization involves _____________ all viable microorganisms. - Answer killing OR removing
A(n) _________ is a chemical that can be used to sterilize materials. - Answer sterilant
All germicides are capable of killing all pathogenic organisms and endospores. - Answer False
An agent that kills bacteria is referred to as __________. - Answer bactericidal
An agent that prevents the growth of bacteria without causing irreversible damage to the bacteria is
referred to as __________. - Answer bacteriostatic
The destruction or removal of all viable organisms is called - Answer sterilization.
The reduction of the microbial population to levels that are considered safe by public health standards is
called - Answer sanitization.
The prevention of infection caused by microorganisms is called - Answer antisepsis.
The substantial reduction of the total population of microorganisms on inanimate objects and the
destruction of potential pathogens is called - Answer disinfection.
, Which of the following represents the best definition of microbial death? - Answer The organism will not
grow on a medium that normally supports its growth.
Time required to kill 90% of microorganisms or spores in a sample at a specified temperature is the -
Answer decimal reduction time (D value).
The rate of killing by an antimicrobial agent may slow when the microbial population has been greatly
reduced because the remaining population may have a high proportion of resistant organisms. - Answer
True
Which of the following influence(s) the efficiency of an antimicrobial agent? - Answer All of the choices
are correct.
Larger populations generally are killed as rapidly as smaller populations. - Answer False
Which will require a longer time to kill? - Answer a larger population of microorganisms
Microorganisms show differential sensitivity to antimicrobial agents. - Answer True
Which of the following environmental factors generally do(es) not have an impact on the efficiency of an
antimicrobial agent? - Answer refractive index
Which of the following is not a method of heat sterilization? - Answer Pasteurization
Which of the following is MOST effective against resistant endospores? - Answer Autoclaving
Which of the following lacks sufficient penetrating power for bulk sterilization? - Answer Ultraviolet (UV)
radiation at 260 nm
Moist heat sterilization at 1000 kills all of the following EXCEPT - Answer bacterial endospores.
