🦠 Microbiology Solved MCQs with Answers

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

1927 solved MCQs

Which of the following is not a semi synthetic chemotherapeutic agent?Answer: Penicillin Which of the following tests is used to determine the minimal lethal concentration?Answer: All of these The mode of action of polymyxin is toAnswer: Injury to the plasma membrane Polyene antibiotics areAnswer: Large ring structures Which of the following may cause resistance to penicillin?Answer: All of these The third generation cephalosporin agents isAnswer: Cefotaxime The penicillin resistant to β-lactamases isAnswer: Closacillin The antibiotics not clinically useful for Pseudomonas aeruginosa infection isAnswer: Trimethoprim-sulphamethoxazole Which of the following drugs may show plasmid-mediated resistance?Answer: Ampicillin The scientist who first discovered the substance penicillin wasAnswer: Alexander Fleming The larger the __________ , the better the chemotherapeutic agent.Answer: Therapeutic index Chelate forming peptide antibiotic are/isAnswer: Both (a) and (b) With which of the following aminoglycosides interfere?Answer: Protein synthesis Which of the following protein synthesis mechanisms may be affected by particular drugs?Answer: All of these The antibiotics not having good activity against Enterobacteriaceae isAnswer: Clindamycin Quinones and related antibiotics areAnswer: All of these Both penicillin and fluoroquinolonesAnswer: Bind to and inactivate a bacterial protein A broad-spectrum antibiotic such as chloramphenicol is one thatAnswer: kills numerous types of microbes Vancomycin inhibits peptidoglycan synthesis by bindingAnswer: D-alanyl - D-alanine Nystatin is a drug used for treatment of diseases caused byAnswer: Yeast Which is not an amino acid and peptide antibiotic?Answer: Tetranactin Cephalosporins and Penicillins interfere with which of the following?Answer: Cell wall synthesis Bacterial cells susceptible to penicillium can be protected from destruction if the medium in which they are exposed is ofAnswer: High osmotic pressure The compound(s) which act(s) as metabolic antagonist is/areAnswer: Both (a) and (b) Amphotericin B and polymyxin interfere withAnswer: Cell membrane function Which of the following is not β-lactamase-resistant penicillin?Answer: Carbenicillin The antibiotics which affords a broad spectrum of antimicrobial coverage against aerobic and anaerobic bacteria, rickettsiae, chlamydiae, and mycoplasmas isAnswer: Tetracycline Which of the following articles can be sterilized in an autoclave?Answer: All of these Which of the following disinfectants act by disrupting microbial membranes?Answer: Cationic detergents Which of the following is best to sterilize heat labile solutions?Answer: Membrane filtration