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WorksheetsControl of Microbial Growth
Total questions: 25
Worksheet time: 11mins
What do you mean by sterilization?
Formulation of media
Elimination of contamination
Recovery of products
Purification of products
The removal or destruction of ALL forms of microbial life is called
sterilization
disinfection
pasteurization
sanitization
To sterilize heat-sensitive solutions such as culture media, enzymes, and vaccines, one should use
dry heat
an autoclave
filtration
pasteurization
The recommended optimum concentration of ethanol to use as a biocide is
100%
70%
50%
10%
The thermal death point is the lowest temperature required to kill a liquid culture of a certain species of bacteria in 10 minutes.
True
False
The suffix -cide means “to survive.”
True
False
Asepsis is the absence of pathogens on an object or area.
True
False
Antimicrobial agents that kill microorganisms would be classified as ______________.
microbistatic
microbicidal
When all forms of microbial life have been removed or destroyed, it is ______
disinfected
pasteurized
neutralized
sterilized
Milk and other beverages undergo a mild heating process to destroy a particular spoilage or disease-causing organism. this is known as
sterilization
degerming
decontamination
pasteurization
Food that is dried to prevent microbial growth utilizes
lyophilization.
desiccation.
filtration.
ionizing radiation.
Silver nitrate and copper sulfate are antimicrobials that denature proteins and are considered ______________.
heavy metals
surface-active agents.
organic acids
halogens
What is the choice of sterilizing inoculation loop?
Phenol
Autoclaving
Dry heat oven
Direct flaming
A nosocomial infection is a:
Hospital acquired infection
Highly contagious pathogen that requires strict transmission control conditions
Minor infection
An infection spread by close contact with others in the home
________ is the suffix that indicates a chemical or process inhibits growth or multiplication of bacteria.
-stat
-cide
-tion
-a
A pore size of _______ is often used to filter most bacteria.
0.08 um
0.40 um
0.05 um
0.22 um
___________ kills vegetative bacteria within minutes, and spores within 3-10 hours.
Hydrogen peroxide
Glutaraldehyde
Lysol
Alcohol
Which of the following chemicals are easily inactivated by oganic material?
Phenolic compounds
Chlorine compounds
Chlorhexidine
Benzethonium chloride
Methods to physically control microbial growth include
osmotic pressure
phenolics
soaps/surfactants
heavy metals
Excessive use of this chemical may cause neurological damage.
phenols
phenolics
bisphenols
It is used as surgical hand scrubs when combined with alcohol
phenolics
chlorine
chlorhexidine
iodophors
It is used to preserve red color of meat and prevent groth of C. botulinum.
sulfur dioxide
sorbic acid
sodium nitrate
calcium propionate
What physical method can be used to preserved food products?
osmotic pressure
heat
high pressure
filtration
A pasteurization method wherein milk is exposed to 72 degree celsius for 15 seconds.
classic method
ultra high temperature
high temperature short time
all of the above
Under which circumstance would one use an antiseptic?
to clean your kitchen counter
to prepare skin prior to giving a flu vaccine
to clean the toilet when someone has vomited
All of these
