MMSC 438 Final Verified Multiple Choice and
Conceptual Actual Frequently Tested Exam
Questions With Reviewed 100% Correct
Detailed Answers
Guaranteed Pass!!Current Update!!
Q1. What is synergy in antimicrobial therapy?
A: When two antimicrobial agents are used together, producing enhanced
activity compared to either drug acting alone.
Q2. What is antagonism in antimicrobial therapy?
A: When two antimicrobial agents are used together and the combined
activity is less than that of the strongest drug used alone.
Q3. What is indifference in drug interactions?
A: When two antimicrobial agents are used together and the activity is equal
to that of the strongest single agent used alone.
Q4. What does additive effect mean in antimicrobial combinations?
A: When two antimicrobial agents act together and their combined effect
equals the sum of their individual activities.
Q5. What is a breakpoint in antimicrobial testing?
A: A defined MIC (Minimum Inhibitory Concentration) or zone of inhibition
cutoff that distinguishes susceptible (S), intermediate (I), and resistant (R)
bacterial responses in Kirby-Bauer disk diffusion testing.
• Determined by the Clinical and Laboratory Standards Institute (CLSI).
Q6. What is a breakpoint panel?
A: A microdilution susceptibility test performed using a single antibiotic
,concentration to determine whether a bacterial isolate’s MIC is above or below
the established breakpoint.
• Results are reported as Susceptible (S) or Resistant (R).
Q7. What is an antibiogram?
A: A summary chart showing antimicrobial susceptibility patterns of bacterial
isolates to different antibiotics.
• Often used to monitor resistance trends over months or years within a
facility or region.
Q8. What is a side effect?
A: An unintended or unwanted effect that occurs as a result of taking a drug or
antibiotic.
Q9. Define toxicity in relation to antimicrobials.
A: A harmful physiological effect that occurs when excessive amounts of a
drug accumulate in the body, leading to poisoning or organ damage.
• Causes include overdose, decreased metabolism, or drug accumulation.
• Some drugs require close monitoring to prevent toxic buildup.
Q10. What is ototoxicity?
A: Drug-induced hearing impairment resulting from toxic effects on the
auditory system.
• Commonly associated with Chloramphenicol and aminoglycosides.
Q11. What are bactericidal drugs?
A: Agents that kill bacteria directly, leading to cell death.
Q12. What are bacteriostatic drugs?
A: Agents that inhibit bacterial growth or replication, allowing the immune
system to clear the infection.
,effective antimicrobial agent - ANSWER -selectively toxic: active against
pathogen, not harmful to patient
-able to penetrate into infected tissues (active in body fluids, blood and exudates)
-active concentrations are achieved rapidly in the body
-organisms do not develop resistance
-cost effective
antibiotic modes of action - ANSWER -cell wall synthesis inhibition
-plasma membrane damage
-protein synthesis inhibition
-nucleic acid synthesis
-metabolic pathway inhibition
ß-lactams - ANSWER cell wall synthesis inhibitors that irreversibly bind to
bacterial transpeptidase (PBPs) enzymes so that cells cannot produce a mature
peptidoglycan cell wall
-penicillins
-cephalosporins
-carbapenems
-monobactams
glycopeptides - ANSWER cell wall syntehsis inhibitors that bind to terminal D-
alanines and prevent crosslinking of peptidoglycan in *gram positive* cell walls
-vancomycin
, -teicoplanin
polypeptides - ANSWER plasma membrane damagers that break up the outer
plasma membrane of *gram negative* bacteria
-polymyxin
-colisitin
tetracyclines - ANSWER protein synthesis inhibitors that bind to bacterial
ribosome and prevent production of proteins
-tetracycline
-doxicycline
macrolides - ANSWER protein synthesis inhibitors that bind to bacterial
ribosome and prevent production of proteins
-erythromycin
-azithromycin
aminoglycosides - ANSWER protein synthesis inhibitors that bind to bacterial
ribosome and prevent production of proteins
-gentamycin
-streptomycin
chloramphenicols - ANSWER protein synthesis inhibitors that bind to bacterial
ribosome and prevent production of proteins
Conceptual Actual Frequently Tested Exam
Questions With Reviewed 100% Correct
Detailed Answers
Guaranteed Pass!!Current Update!!
Q1. What is synergy in antimicrobial therapy?
A: When two antimicrobial agents are used together, producing enhanced
activity compared to either drug acting alone.
Q2. What is antagonism in antimicrobial therapy?
A: When two antimicrobial agents are used together and the combined
activity is less than that of the strongest drug used alone.
Q3. What is indifference in drug interactions?
A: When two antimicrobial agents are used together and the activity is equal
to that of the strongest single agent used alone.
Q4. What does additive effect mean in antimicrobial combinations?
A: When two antimicrobial agents act together and their combined effect
equals the sum of their individual activities.
Q5. What is a breakpoint in antimicrobial testing?
A: A defined MIC (Minimum Inhibitory Concentration) or zone of inhibition
cutoff that distinguishes susceptible (S), intermediate (I), and resistant (R)
bacterial responses in Kirby-Bauer disk diffusion testing.
• Determined by the Clinical and Laboratory Standards Institute (CLSI).
Q6. What is a breakpoint panel?
A: A microdilution susceptibility test performed using a single antibiotic
,concentration to determine whether a bacterial isolate’s MIC is above or below
the established breakpoint.
• Results are reported as Susceptible (S) or Resistant (R).
Q7. What is an antibiogram?
A: A summary chart showing antimicrobial susceptibility patterns of bacterial
isolates to different antibiotics.
• Often used to monitor resistance trends over months or years within a
facility or region.
Q8. What is a side effect?
A: An unintended or unwanted effect that occurs as a result of taking a drug or
antibiotic.
Q9. Define toxicity in relation to antimicrobials.
A: A harmful physiological effect that occurs when excessive amounts of a
drug accumulate in the body, leading to poisoning or organ damage.
• Causes include overdose, decreased metabolism, or drug accumulation.
• Some drugs require close monitoring to prevent toxic buildup.
Q10. What is ototoxicity?
A: Drug-induced hearing impairment resulting from toxic effects on the
auditory system.
• Commonly associated with Chloramphenicol and aminoglycosides.
Q11. What are bactericidal drugs?
A: Agents that kill bacteria directly, leading to cell death.
Q12. What are bacteriostatic drugs?
A: Agents that inhibit bacterial growth or replication, allowing the immune
system to clear the infection.
,effective antimicrobial agent - ANSWER -selectively toxic: active against
pathogen, not harmful to patient
-able to penetrate into infected tissues (active in body fluids, blood and exudates)
-active concentrations are achieved rapidly in the body
-organisms do not develop resistance
-cost effective
antibiotic modes of action - ANSWER -cell wall synthesis inhibition
-plasma membrane damage
-protein synthesis inhibition
-nucleic acid synthesis
-metabolic pathway inhibition
ß-lactams - ANSWER cell wall synthesis inhibitors that irreversibly bind to
bacterial transpeptidase (PBPs) enzymes so that cells cannot produce a mature
peptidoglycan cell wall
-penicillins
-cephalosporins
-carbapenems
-monobactams
glycopeptides - ANSWER cell wall syntehsis inhibitors that bind to terminal D-
alanines and prevent crosslinking of peptidoglycan in *gram positive* cell walls
-vancomycin
, -teicoplanin
polypeptides - ANSWER plasma membrane damagers that break up the outer
plasma membrane of *gram negative* bacteria
-polymyxin
-colisitin
tetracyclines - ANSWER protein synthesis inhibitors that bind to bacterial
ribosome and prevent production of proteins
-tetracycline
-doxicycline
macrolides - ANSWER protein synthesis inhibitors that bind to bacterial
ribosome and prevent production of proteins
-erythromycin
-azithromycin
aminoglycosides - ANSWER protein synthesis inhibitors that bind to bacterial
ribosome and prevent production of proteins
-gentamycin
-streptomycin
chloramphenicols - ANSWER protein synthesis inhibitors that bind to bacterial
ribosome and prevent production of proteins
