a. Gram negative > Gram positive > Spores
b. Gram negative > Spores > Gram positive
c. Gram positive > Gram negative > Spores
d. Spores > Gram positive > Gram negative
Disinfection is defined as:
a. The killing or removal of all living organisms and their viruses from on or within a material.
b. The use of agents that reduce, but may not eliminate, microbial numbers to a safe level.
c. A treatment that renders an object or inanimate surface safe to handle.
d. The elimination of microorganisms from inanimate objects or surfaces.
Which type of filter is most commonly used for liquid sterilisation?
a. Nucleopore filters
b. Depth filters.
c. Membrane filters.
d. Nitrocellulose filters.
Ozone is a:
a. Low level disinfectant.
b. Not a disinfectant.
c. High level disinfectant.
d. Intermediate level disinfectant
Chemicals that prevent bacterial growth but do not kill the cells are known as?
a. Biocides.
b. Bacteriophage.
c. Bacteriostatic.
d. Bacteriocides
Microbial death rate under a particular treatment usually occurs at:
a. At a variable rate as more cells are killed.
b. A constant linear rate.
c. A constant exponential rate.
d. Depends on the starting number of cells.
Sterilisation by heat functions by:
a. Denaturation of DNA.
b. Denaturation of protein.
c. Disruption of membrane structure.
d. All of these.
The thermal death time is:
b. Gram negative > Spores > Gram positive
c. Gram positive > Gram negative > Spores
d. Spores > Gram positive > Gram negative
Disinfection is defined as:
a. The killing or removal of all living organisms and their viruses from on or within a material.
b. The use of agents that reduce, but may not eliminate, microbial numbers to a safe level.
c. A treatment that renders an object or inanimate surface safe to handle.
d. The elimination of microorganisms from inanimate objects or surfaces.
Which type of filter is most commonly used for liquid sterilisation?
a. Nucleopore filters
b. Depth filters.
c. Membrane filters.
d. Nitrocellulose filters.
Ozone is a:
a. Low level disinfectant.
b. Not a disinfectant.
c. High level disinfectant.
d. Intermediate level disinfectant
Chemicals that prevent bacterial growth but do not kill the cells are known as?
a. Biocides.
b. Bacteriophage.
c. Bacteriostatic.
d. Bacteriocides
Microbial death rate under a particular treatment usually occurs at:
a. At a variable rate as more cells are killed.
b. A constant linear rate.
c. A constant exponential rate.
d. Depends on the starting number of cells.
Sterilisation by heat functions by:
a. Denaturation of DNA.
b. Denaturation of protein.
c. Disruption of membrane structure.
d. All of these.
The thermal death time is:
