Microbiology Practical Exam Questions with 100% Correct Answers | Verified | Updated

Microbiology Practical Exam Questions with 100% Correct Answers | Verified | Updated Which of the following is NOT associated with the work of Paul Ehrlich? sulfanilamide the concept of the "magic bullet" arsenic compounds the concept of chemotherapy - answersulfanilamide Paul Ehrlich's idea of the "magic bullet" was the first step in the field of chemotherapy and resulted in the use of arsenic compounds in the treatment of syphilis. Sulfanilamide was the discovery of Gerhard Domagk. Which of the following is NOT a direct mode of action of antimicrobial drugs? inhibition of cell wall synthesis inhibition of protein synthesis inhibition of nucleic acid synthesis inhibition of flagella formation - answerinhibition of flagella formation. Antimicrobial drugs can inhibit protein or nucleic acid synthesis and can also inhibit the formation of the cell wall. Inhibition of flagella formation might be an indirect result of the action of some antimicrobial drugs, but it is not a direct target. Which of the following is NOT a beta-lactam antibiotic? methicillin vancomycin cephalothin penicillin G - answerVancomycin. Methicillin, penicillin G, and cephalothin are all examples of beta-lactam antibiotics. Vancomycin inhibits cell wall formation in bacteria, but it has a different chemical structure. Clavulanic acid could be used to protect which of the following antibiotics in a drug formulation? penicillin sulfanilamide bacitracin erythromycin - answerpenicillin. Clavulanic acid is often combined with beta-lactam drugs such as penicillin because it exhibits a synergistic effect with the drug by inhibiting the activity of beta-lactamase. Which of the following is NOT a type of side effect exhibited by antimicrobial drugs? allergic reactions disruption of normal microbiota inhibition of host cellular enzymes damage to liver or kidney tissue - answerinhibition of host cellular enzymes. The damaging side effects that can be caused by these drugs are due to unintentional outcomes such as allergies, toxicity, or disruption of normal microbiota. Which of the following is NOT associated with microbial mechanisms of resistance? denaturation of proteins porins MfpA protein beta-lactamases - answerdenaturation of proteins. Proteins are not denatured by antimicrobial drugs. Why is penicillin regarded as the first true antibiotic? Ehrlich's arsenic-based compounds were produced after the discovery and mass production of penicillin. It is effective against a wide variety of bacteria. The sulfonamides were not effective in treating any bacterial infections. It is produced naturally by the fungus Penicillium. - answerIt is produced naturally by the fungus Penicillium. The term antibiotic refers to an antimicrobial molecule produced naturally by a microbe, as opposed to one produced artificially in the laboratory. An antimicrobial drug that blocks the transport of NAG and NAM from the cytoplasm is targeting which of the following cellular pro