🦠 Microbiology Solved MCQs with Answers

Practice 1927 approved 🦠 Microbiology questions with verified answers from the 🧬 Medical Science subject for Pakistan exams.

1927 solved MCQs

Activated sludge undergoesAnswer: Secondary treatment The rate of flux of oxygen in air is __________ to/than the rate of flux of oxygen in water.Answer: Greater __________ is an environment like __________ where microorganisms are functioning in an extremely thin film of water and where oxygen-containing air is close to them.Answer: high oxygen diffusion environment; soils Which of the following is a drug that interferes with the process of DNA production in the virus that causes genital herpes?Answer: Acyclovir Which of the antibiotic is not used as a food preservative ?Answer: β-lactam antibiotic The most selective antibiotics are those that interfere with the synthesis ofAnswer: Bacterial cell walls Cycloserine inhibitsAnswer: Both (a) and (b) Which antibiotic has a beta-lactam ring?Answer: Penicillin Chemotherapeutic agents mustAnswer: All of these Novobiocin can be used againstAnswer: All of these Interference mechanism of ciprofloxacin and norfloxacin is due to their action onAnswer: DNA function By which of the following means antifungal chemotherapeutic agents may affect fungi?Answer: All of these Which of the following methods would be most appropriate for sterilizing an antibiotic solution?Answer: Microfiltration Which of the following drugs involves modification of the drug by enzymatic modification or degradation of its active element to alter its/their resistance?Answer: All of these Which of the following drugs involves modification of the drug by enzymatic modification or degradation of its active element to alter its/their resistance?Answer: All of these Who developed the concept of specific toxicity?Answer: Ehrlich When using alcohol as an antiseptic, which concentration is considered most effective?Answer: 70% Fluoroquinolones are antibiotics which inhibitAnswer: DNA gyrase Which of the following is used only in life-threatening situations when no other drug is adequate?Answer: Chloramphenicol The susceptibility of a microorganism to antibiotics and other chemotherapeutic agents can be determined by usingAnswer: Both (a) and (b) Most antibiotics are isolated fromAnswer: Soil microorganisms Which of the following group is not the carbohydrate containing antibiotic?Answer: Erythromycin & candicidin The penicillin stable in gastric acid and suitable for oral administration isAnswer: Closacillin Which of the following is not an example of potent antitumer agents?Answer: Erythromycin More promising chemotherapeutic agents for treating viral diseases isAnswer: Interferon A parenteral route of drug administration refers toAnswer: Nonoral Which of the following antibiotics can't be used for treatment of infections with β-lactamase-producing Staphylococcus aureus?Answer: Piperacillin Which of the following is not an aminoglycoside antibiotic?Answer: Cephalosporin The nitrofurans differ from the antibiotics in that theyAnswer: Do not occur naturally Quinolones areAnswer: Broad-spectrum