Antibiotics can be either bactericidal (killing bacteria) or bacteriostatic (suppressing bacterial growth).
Correct Answer
True
Bactericidal antibiotics directly kill bacteria, while bacteriostatic antibiotics suppress their growth and multiplication, allowing the immune system to eliminate them.
Question 2
Penicillin was discovered in 1928 by Alexander Fleming.
Correct Answer
True
Fleming discovered that Penicillium notatum mold prevented the growth of Staphylococcus aureus, ushering in the era of antibiotic use.
Question 3
Penicillins work by inhibiting bacterial protein synthesis.
Correct Answer
False
Penicillins work by binding to penicillin-binding proteins and inhibiting bacterial cell wall cross-link formation, causing holes in the cell wall and cellular death.
Question 4
Cephalosporins share the same mechanism of action as penicillins.
Correct Answer
True
Both are beta-lactam antibiotics that disrupt bacterial cell wall integrity. They differ in the types of bacteria they are effective against.
Question 5
The fifth-generation cephalosporin ceftaroline has activity against MRSA.
Correct Answer
True
Ceftaroline is the only cephalosporin with activity against methicillin-resistant Staphylococcus aureus (MRSA).
Macrolides inhibit protein production by bacterial ribosomes. They do not directly kill bacteria but suppress reproduction enough for the immune system to eliminate the infection.
Question 7
Macrolides can inhibit the liver enzyme CYP3A4, potentially causing drug interactions.
Correct Answer
True
Medications metabolized by CYP3A4 will not undergo metabolism at the expected rate when macrolides are given, leading to increased serum drug levels and potential toxicity.
Question 8
Superinfections occur when broad-spectrum antibiotics kill off normal nonpathogenic bacteria.
Correct Answer
True
This leaves behind drug-resistant bacteria that can produce a new infection that is more difficult to treat.
Question 9
Antibiotic resistance is primarily caused by underuse of antibiotics.
Correct Answer
False
Most antibiotic drug resistance occurs due to antibiotic overuse, both in humans and in agriculture. Providers should prescribe antibiotics only when bacterial infection is sufficiently probable.
Question 10
Beta-lactamase is an enzyme produced by resistant bacteria to cleave the beta-lactam ring.
Correct Answer
True
Beta-lactamase renders beta-lactam antibiotics like penicillin ineffective. Beta-lactamase inhibitors such as clavulanic acid are combined with penicillins to overcome this resistance.
Question 11
Oral vancomycin is effective against bloodstream infections.
Correct Answer
False
Oral vancomycin has good activity against Clostridioides difficile colitis but is completely ineffective against bloodstream pathogens. IV vancomycin is used for systemic infections.
Question 12
Vancomycin is entirely renally eliminated and requires monitoring of renal function and serum drug levels.
Correct Answer
True
Because vancomycin is eliminated by the kidneys, renal function must be monitored along with drug levels to ensure proper dosing and prevent toxicity.
Question 13
Fluoroquinolones work by inhibiting the bacterial enzyme DNA gyrase.
Correct Answer
True
DNA gyrase is responsible for winding and unwinding bacterial DNA. Inhibition leads to increased DNA strand breakage and eventual programmed cell death.
Question 14
Aminoglycosides like gentamicin have broad-spectrum gram-positive activity.
Correct Answer
False
Aminoglycosides are used primarily for their broad-spectrum gram-negative activity, including against Pseudomonas aeruginosa.
Question 15
Clindamycin can treat both gram-positive infections and anaerobic bacterial infections.
Correct Answer
True
Clindamycin is a protein synthesis inhibitor with strong gram-positive coverage (including MRSA) and anaerobic coverage, useful for skin infections and animal bites.
Question 16
An antibiogram helps health care providers determine regional bacterial resistance patterns.
Correct Answer
True
Hospital systems develop antibiograms from cultured bacterial samples to identify which antibiotics are most effective at their facility.
Question 17
Tetracyclines work by disrupting the bacterial cell wall.
Correct Answer
False
Tetracyclines work by inhibiting bacterial protein synthesis, which suppresses bacterial growth. They treat conditions such as acne, Lyme disease, and anthrax.
Question 18
The combination of sulfamethoxazole and trimethoprim interferes with the folic acid pathway in bacteria.
Correct Answer
True
These drugs work at different steps along the folic acid pathway necessary for bacterial DNA, RNA, and protein production, leading to cell death.
Question 19
Metronidazole has good activity against aerobic bacteria.
Correct Answer
False
Metronidazole has good activity against anaerobic bacteria and protozoa, making it useful for treating STIs and vaginal infections.
Question 20
Amoxicillin plus clavulanic acid (Augmentin) is an example of a penicillin combined with a beta-lactamase inhibitor.
Correct Answer
True
Clavulanic acid protects amoxicillin from being destroyed by beta-lactamase enzymes, expanding its spectrum of activity.
Question 21
First-generation cephalosporins like cephalexin can treat meningitis.
Correct Answer
False
First-generation cephalosporins treat uncomplicated UTIs and upper respiratory infections. Third-generation cephalosporins like ceftriaxone are used for more serious infections such as meningitis.
Question 22
Linezolid is used to treat infections that are resistant to vancomycin.
Correct Answer
True
Linezolid treats gram-positive infections that are highly resistant to agents such as vancomycin, including vancomycin-resistant Staphylococcus aureus (VRSA).
Question 23
Azithromycin, clarithromycin, and erythromycin are all macrolide antibiotics.
Correct Answer
True
These macrolide agents inhibit protein production by bacterial ribosomes and are useful for treating respiratory infections and atypical bacterial infections.
Question 24
Bacteria cannot share genetic material that codes for drug resistance with other bacteria.
Correct Answer
False
Some bacteria are able to share snippets of DNA that code for drug resistance with other bacteria, which contributes to the spread of antibiotic resistance.
Question 25
Health care providers should prescribe antibiotics only when there is sufficient probability of a bacterial infection.
Correct Answer
True
Prescribing antibiotics without sufficient evidence of bacterial infection contributes to antibiotic overuse and the development of resistant strains.