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EXAM 2 MCB3020 BACUSMO QUESTIONS AND ANSWERS
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EXAM 2 MCB3020 BACUSMO QUESTIONS AND ANSWERS
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Name: Score:81 Multiple choice questions
Term 1 of 81
Verification of the success of an autoclave run is measured by Blank______.
checking the ph of the autoclave contents
measuring the temperature inside the autoclave
including bacterial endospores in the run and testing their viability following the run
multiple choice question.
Term 2 of 81
In general, which of the following organisms tends to have a single circular chromosome
composed of DNA?
fungi
bacteria
viruses
peptidoglycan
Term 3 of 81
When an object is totally free of viable microorganisms, spores, viruses, prions, and other
infectious agents, it is said to be _______.
CONTAMINATED
STERILE
DIRTY
INFECTED
,Term 4 of 81
Which of the following terms describes a chemical that is used destroy all infectious agents
(including viruses and endospores) on an object?
detergent
sterilant
disinfectant
autoclave
Term 5 of 81
Choose two phrases that describe "disinfection".
Multiple select question.
The destruction of potential pathogens
The elimination of all microbes
The conversion of viable cells to persisters
The reduction of the microbial population
-Effective against a range of microorganisms
-Contains viricidal properties
-Non-toxic to humans or animals
starvation
poisoning
- some treatments have different effects depending on the conditions
- some of the words are in common use with imprecise meanings
-The destruction of potential pathogens
-The reduction of the microbial population
,Term 6 of 81
A numerical measure of the efficiency of a biocidal agent is the time required to kill 90% of the
culture. This number is the_____ value.
False
D
cell
260 nm
Term 7 of 81
Standard autoclave conditions (121°C, 15 pounds of pressure, 15 minutes) will sterilize which two
of the following?
Multiple select question.
260 nm
-250 ml empty Pyrex flasks
-3 ml bacterial broth culture in a test tube
- some treatments have different effects depending on the conditions
- some of the words are in common use with imprecise meanings
Transcription of RNA
DNA replication
Term 8 of 81
UV radiation around 260 nm causes thymine-thymine dimerization of DNA which prevents
which two of the following processes?
Multiple select question.
Transcription of RNA
DNA replication
Oxidation
Heat
Radiation
Filtration
Septation
, Term 9 of 81
The D value of a biocidal agent is measured in units of
time
turgor pressure
distance
place
Term 10 of 81
On the left side of the figure, which component of a Gram negative cell is affected by
glutaraldehyde?
Including bacterial endospores in the run and testing their viability following the run
Proteins in the outer membrane
Cytokinesis
Dna in the nucleoid
Term 11 of 81
The primary mechanisms of action of quaternary ammonium compounds are Blank______.
Multiple select question.
denaturation of nucleic acids
disruption of microbial membranes
denaturation of proteins
oxidation of protein sulfhydryls
Quorum Sensing
-250 ml empty Pyrex flasks
-3 ml bacterial broth culture in a test tube
-disruption of microbial membranes
-denaturation of proteins
-The destruction of potential pathogens
-The reduction of the microbial population
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