MICROBIOLOGY LAB FINAL EXAM QUESTIONS
WITH CORRECT ANSWERS 2025/2026
A large zone of inhibition probably means that the bacteria is
________________________________ to that antibiotic. - CORRECT ANSWER -sensitive
A disc with no zone of inhibition around it tells the antibiotic that the
_______________________________________________________________. - CORRECT
ANSWER -particular bacteria is resistant
Measure the diameter of the zones in __________________________ not centimeters. -
CORRECT ANSWER -millimeters
The Mueller-Hinton agar, plates are inoculated with
___________________________________________. - CORRECT ANSWER -cotton swabs
Kirby Bauer test uses a special type of agar, which is
_______________________________________________. - CORRECT ANSWER -Mueller-Hinton
agar
Zone of inhibition - CORRECT ANSWER -a clear, circular area appears around the disc
The Kirby Bauer method is widely used for testing the ____________________________ of
bacteria to antimicrobials. - CORRECT ANSWER -sensitivity
What is the goal of the Kirby Bauer method? - CORRECT ANSWER -is to find out whether the
bacteria being tested are sensitive to the antibiotic or resistant to the antibiotic.
,Penicillin is more effective against ___________________________________________. -
CORRECT ANSWER -gram-positive bacteria
Polymycin B, have a greater effect against ________________________________________. -
CORRECT ANSWER -gram-negative bacteria
If the bacteria grow right up to the disk and do not show any kind of zone of inhibition, the
bacterium is ____________________________. - CORRECT ANSWER -resistant
Antimicrobial - CORRECT ANSWER -something that kills or inhibits microorganisms
The common methods of antimicrobial susceptibility testing end... - CORRECT ANSWER -on
bacterial count (either directly or indirectly) under different conditions.
Allow a way to visualize the impairment of cell growth.
Carbuncle - CORRECT ANSWER -damage and inflammation of deep tissue from a spreading
furuncle
When measuring the zone of inhibition for organisms that swarm, ignore the... - CORRECT
ANSWER -thin veil of swarming growth in an otherwise obvious zone of inhibition
The zone margin should be considered the area showing... - CORRECT ANSWER -no obvious
visible growth that can be detected with the unaided eye
White circle, while measuring zones of inhibition... - CORRECT ANSWER -represents no growth
of the test organism
Gray shading, while measuring zones of inhibition... - CORRECT ANSWER -represents a confluent
lawn of bacterial growth
, The interpretation of resistance and susceptibility to antimicrobials is determined through in... -
CORRECT ANSWER -Vivo testing of blood and urine to calculate
The obtainable level of a given antimicrobial that results in resolution of an infection
Critical concentration - CORRECT ANSWER -concentration of antimicrobial compound at the
margin
Capsules serve as... - CORRECT ANSWER -energy and water reserves, a means to evade a hosts
immune system
S. mutans - CORRECT ANSWER -bacterium in the mouth produces acid and weakens the enamel
Capsules are delicate structures that are destroyed by... - CORRECT ANSWER -heat fixing
washed away during staining procedures
Capsules also _____________________________ because of the composition of capsule. -
CORRECT ANSWER -attract water
The original method of determining susceptibility to antimicrobials was based on
___________________________________________. - CORRECT ANSWER -broth dilution
methods 5 & 7
In capsule staining, the stain will color the____________________________________. -
CORRECT ANSWER -Bacterial cell and the background
WITH CORRECT ANSWERS 2025/2026
A large zone of inhibition probably means that the bacteria is
________________________________ to that antibiotic. - CORRECT ANSWER -sensitive
A disc with no zone of inhibition around it tells the antibiotic that the
_______________________________________________________________. - CORRECT
ANSWER -particular bacteria is resistant
Measure the diameter of the zones in __________________________ not centimeters. -
CORRECT ANSWER -millimeters
The Mueller-Hinton agar, plates are inoculated with
___________________________________________. - CORRECT ANSWER -cotton swabs
Kirby Bauer test uses a special type of agar, which is
_______________________________________________. - CORRECT ANSWER -Mueller-Hinton
agar
Zone of inhibition - CORRECT ANSWER -a clear, circular area appears around the disc
The Kirby Bauer method is widely used for testing the ____________________________ of
bacteria to antimicrobials. - CORRECT ANSWER -sensitivity
What is the goal of the Kirby Bauer method? - CORRECT ANSWER -is to find out whether the
bacteria being tested are sensitive to the antibiotic or resistant to the antibiotic.
,Penicillin is more effective against ___________________________________________. -
CORRECT ANSWER -gram-positive bacteria
Polymycin B, have a greater effect against ________________________________________. -
CORRECT ANSWER -gram-negative bacteria
If the bacteria grow right up to the disk and do not show any kind of zone of inhibition, the
bacterium is ____________________________. - CORRECT ANSWER -resistant
Antimicrobial - CORRECT ANSWER -something that kills or inhibits microorganisms
The common methods of antimicrobial susceptibility testing end... - CORRECT ANSWER -on
bacterial count (either directly or indirectly) under different conditions.
Allow a way to visualize the impairment of cell growth.
Carbuncle - CORRECT ANSWER -damage and inflammation of deep tissue from a spreading
furuncle
When measuring the zone of inhibition for organisms that swarm, ignore the... - CORRECT
ANSWER -thin veil of swarming growth in an otherwise obvious zone of inhibition
The zone margin should be considered the area showing... - CORRECT ANSWER -no obvious
visible growth that can be detected with the unaided eye
White circle, while measuring zones of inhibition... - CORRECT ANSWER -represents no growth
of the test organism
Gray shading, while measuring zones of inhibition... - CORRECT ANSWER -represents a confluent
lawn of bacterial growth
, The interpretation of resistance and susceptibility to antimicrobials is determined through in... -
CORRECT ANSWER -Vivo testing of blood and urine to calculate
The obtainable level of a given antimicrobial that results in resolution of an infection
Critical concentration - CORRECT ANSWER -concentration of antimicrobial compound at the
margin
Capsules serve as... - CORRECT ANSWER -energy and water reserves, a means to evade a hosts
immune system
S. mutans - CORRECT ANSWER -bacterium in the mouth produces acid and weakens the enamel
Capsules are delicate structures that are destroyed by... - CORRECT ANSWER -heat fixing
washed away during staining procedures
Capsules also _____________________________ because of the composition of capsule. -
CORRECT ANSWER -attract water
The original method of determining susceptibility to antimicrobials was based on
___________________________________________. - CORRECT ANSWER -broth dilution
methods 5 & 7
In capsule staining, the stain will color the____________________________________. -
CORRECT ANSWER -Bacterial cell and the background
