MCB 2010 Test 2 (IRSC) Questions with Complete Solutions 100% Solved| Grade A+
Which of the following microbial methods does not actually kill microbes or inhibit their growth
but instead removes them physically from samples? filtration
In an autoclave, the application of pressure to ___________ is increased to allow the steam to
achieve temperatures above the boiling point of waiter boiling water
Ionizing radiation can penetrate surfaces, but non-ionizing radiation cannot False (other way
around)
Moist-heat sterilization protocols require the use of higher temperatures for longer periods of
time than dry-heat sterlization protocols do False (other way around)
How does the addition of salt or sugar help preserve food? Create hypertonic environment
that "sucks" the water out of bacterial cells and keeps food lasting longer
Which is more effective at killing microbes: autoclaving or freezing? Autoclaving. Freezing
just slows down microbial growth
UV does not penetrate well True
The milk that you find on the room temperature shelves was made using what process?
pasteurization
Why are many heavy metals both antimicrobial and toxic to humans? Heavy metal ions
denature proteins and can harm both humans and microbes
Which of the following oxidizing agent is widely used as a household disinfectant, is expensive,
and breaks down into water and oxygen gas? Ozone
, Bleach is an example of which group of chemicals used for disinfectants? Halogens
Which type of test is used to determine whether disinfectant solutions actively used in a clinical
setting are being used correctly? in-use test
The effectiveness of chemical disinfectants has historically been compared to that of which of
the following? Phenol
Use-dilution test Metal cylinders dipped into broth cultures of bacteria, contaminated
cylinder immersed into dilution of disinfectant, cylinders removed, washed, and places into
tube of medium, most effective agents entirely prevent growth at highest dilution
In-use test Swabs taken from objects before and after application of disinfectant or
antiseptic, swabs inoculated into growth medium and incubated, medium monitored for
growth, accurate determination of proper strength and application procedure for each specific
situation
Ehrlich arsenic
Fleming Penicillin
Domagk sulfanilamide
Waksman natural antibiotics
Neomycin is an example of an antibiotic that is synthetic True
How do beta-lactam drugs kill bacteria? they bind to enzymes that cross link NAM subunits
Which of the following microbial methods does not actually kill microbes or inhibit their growth
but instead removes them physically from samples? filtration
In an autoclave, the application of pressure to ___________ is increased to allow the steam to
achieve temperatures above the boiling point of waiter boiling water
Ionizing radiation can penetrate surfaces, but non-ionizing radiation cannot False (other way
around)
Moist-heat sterilization protocols require the use of higher temperatures for longer periods of
time than dry-heat sterlization protocols do False (other way around)
How does the addition of salt or sugar help preserve food? Create hypertonic environment
that "sucks" the water out of bacterial cells and keeps food lasting longer
Which is more effective at killing microbes: autoclaving or freezing? Autoclaving. Freezing
just slows down microbial growth
UV does not penetrate well True
The milk that you find on the room temperature shelves was made using what process?
pasteurization
Why are many heavy metals both antimicrobial and toxic to humans? Heavy metal ions
denature proteins and can harm both humans and microbes
Which of the following oxidizing agent is widely used as a household disinfectant, is expensive,
and breaks down into water and oxygen gas? Ozone
, Bleach is an example of which group of chemicals used for disinfectants? Halogens
Which type of test is used to determine whether disinfectant solutions actively used in a clinical
setting are being used correctly? in-use test
The effectiveness of chemical disinfectants has historically been compared to that of which of
the following? Phenol
Use-dilution test Metal cylinders dipped into broth cultures of bacteria, contaminated
cylinder immersed into dilution of disinfectant, cylinders removed, washed, and places into
tube of medium, most effective agents entirely prevent growth at highest dilution
In-use test Swabs taken from objects before and after application of disinfectant or
antiseptic, swabs inoculated into growth medium and incubated, medium monitored for
growth, accurate determination of proper strength and application procedure for each specific
situation
Ehrlich arsenic
Fleming Penicillin
Domagk sulfanilamide
Waksman natural antibiotics
Neomycin is an example of an antibiotic that is synthetic True
How do beta-lactam drugs kill bacteria? they bind to enzymes that cross link NAM subunits
