MCB Practice Quiz Ch20, Ch21,Ch22,Ch23,Ch24,Ch25,Ch26 Questions & Answers
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Course
MCB Practice
Institution
MCB Practice
Ch 20. You have a 200 mg/ml antibiotic solution. You prepare serial dilutions (1:2, 1:4, etc.) of the antibiotic; the first tube contains 100 mg/ml. You then inoculate each tube with Salmonella. Bacteria grow in tubes 4, 5, and 6. You subculture bacteria from tubes 1 through 3 to nutrient broth. Gr...
MCB Practice Quiz Ch20,
Ch21,Ch22,Ch23,Ch24,Ch25,Ch26
Questions & Answers
Ch 20. You have a 200 mg/ml antibiotic solution. You prepare serial dilutions (1:2, 1:4,
etc.) of the antibiotic; the first tube contains 100 mg/ml. You then inoculate each tube
with Salmonella. Bacteria grow in tubes 4, 5, and 6. You subculture bacteria from tubes
1 through 3 to nutrient broth. Growth occurs in the tube 3 subculture. You can conclude
that the MIC is __________. - ANSWERS25 mg/ml
An antimicrobial drug that inhibits peptidoglycan synthesis is most likely to be effective
against __________. - ANSWERSgram-positive bacteria
Which of the following antibiotics inhibits protein synthesis? - ANSWERSstreptomycin
You are reviewing the following results of a disk- diffusion antibiotic susceptibility test on
an isolate of Staphylococcus aureus: - ANSWERSThe correct answer cannot be
determined from the information provided.
Which antimicrobial works by inhibiting the synthesis of mycolic acid? -
ANSWERSisoniazid
Which of the following antibiotics is a common choice to treat streptococcal infections in
children? - ANSWERSerythromycin
Which of the following antibiotics inhibits folic acid synthesis? - ANSWERSsulfanilamide
Which of the following drugs inhibits the synthesis of mRNA in bacteria? -
ANSWERSrifampin
Which of the following antibiotics is frequently used as an alternative for those who are
allergic to penicillin? - ANSWERSerythromycin
Which of the following types of antibiotics is most likely to be associated with the
development of a superinfection? - ANSWERSbroad-spectrum antibiotics
Which drug would be used to treat athlete's foot? - ANSWERSclotrimazole
Which antifungal drug was recently introduced to treat systemic fungal infections? -
ANSWERSposaconazole
, Tetracyclines are effective against all of the following EXCEPT __________. -
ANSWERSfungi
A nucleoside analog used to treat HIV infection is __________. - ANSWERSzidovudine
All of the following are antiprotozoan drugs EXCEPT __________. -
ANSWERSmebendazole
Which drug is NOT a nucleoside analog? - ANSWERSnevirapine
Which of the following is the drug of choice for the treatment of malaria? -
ANSWERSchloroquine
The drug Flagyl is commonly used to treat an STD caused by __________. -
ANSWERSTrichomonas vaginalis
Which of the following mechanisms is antifungal? - ANSWERSinhibit ergosterol
synthesis
Which of the following is used for treating influenza infections? - ANSWERSoseltamivir
Ch 21 Which of the following is NOT normal skin microbiota? -
ANSWERSStreptococcus
What do the following diseases have in common?
Scalded skin syndrome
Toxic shock syndrome
Staphylococcal food poisoning - ANSWERSThey are all caused by exotoxins produced
by strains of Staphylococcus aureus.
Which microorganism is responsible for otitis externa? - ANSWERSPseudomonas
aeruginosa
Which of the following is NOT a characteristic of Streptococcus? -
ANSWERScoagulase-positive
Place the following infections in order of increasing tissue involvement and severity:
1. septicemia
2. folliculitis
3. cellulitis
4. furuncle - ANSWERS2, 4, 3, 1
Which of the following may produce infections of the skin with blue-green pus? -
ANSWERSPseudomonas aeruginosa
Warts are generally caused by __________. - ANSWERSpapillomavirus
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