17 Questions
What is the definition of antimicrobials?
Substances that kill or inhibit the growth of bacteria, mycoplasma, viruses, fungi, and protozoa
What differentiates Antibacterial Drugs from Antibiotic Drugs?
Antibiotics are substances that specifically kill bacteria with minimal harm to host cells
Which bacterial strains are mentioned in the text?
Staphylococcus, Streptococcus, Escherichia coli
What does the Disc Diffusion Sensitivity Test determine?
The extent of bacterial sensitivity to an antibiotic
If 64 colonies are present in a plate of 1/1,000 dilution, what is the bacterial count in the sample?
$640$ bacteria/ml
Which term best describes the relationship between Lincomycin and Spectinomycin?
Antagonistic
What is the result of combining Bacteriostatic and Bactericidal antibiotics?
Less effective treatment
Why are human cells not affected by antibiotics due to selective toxicity?
Human cells lack a cell wall
Which factor contributes to the selective toxicity of antibiotics?
Absence of cell wall in bacterial cells
What type of antibiotic resistance occurs when bacteria change the permeability of their cell membrane?
Acquired resistance
Why is Streptomycin ineffective against Gram-positive bacteria?
It cannot penetrate the cell wall of Gram-positive bacteria
Which of the following is a goal of combining antibiotics?
Widen the spectrum of activity
Which two antibiotics are combined to achieve synergistic effect by increasing efficacy?
Spiramycin + Neomycin
In antibiotic combination, which pair achieves a 1+1=2 increase in efficacy?
Spiramycin + Colistin
What type of killers do Aminoglycosides, Penicillins, and Fluoroquinolones fall under?
Concentration dependent killers
Which antibiotic combination does NOT follow the rules of bactericide + bactericide synergism?
Amoxicillin + Colistin on E.
What is the main purpose of combining antibiotics according to the text?
To avoid incidence of bacterial resistance
Test your knowledge on the classification and action of antibiotics including natural, semisynthetic, and synthetic origins, as well as the spectrum of activity from broad to narrow. Explore the difference between bacteriostatic and bactericidal actions.
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