Every antibiotic utilizes the same mechanism of action to kill or inhibit selected microbes. Select one: True False One method of testing the susceptibility of microbes to specific antimicrobials is the Select one: A. litmus test B. sobriety test C. catalase test D. Kirby-Bauer disc drop When an antimicrobial agent is given before surgery to prevent a possible post-surgical infection, we call this Select one: A. surgical intervention B. empiric therapy C. prophylaxis D. medical malpractice
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" Antibiotics work in various ways, such as inhibiting cell wall synthesis, protein synthesis, nucleic acid synthesis, or disrupting cell membranes. Therefore, they do not all utilize the same mechanism of action. Show more…
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1. Which of these is NOT a potential method that can be used to discover new antimicrobials? A. Look for antimicrobial producing microbes in new environments. B. Chemically modify existing antimicrobials. C. Discover drugs that can inhibit drug resistance mechanisms. D. Use mutagens to mutate pathogens so they are no longer drug resistant. 2. The Kirby Bauer disk diffusion test can NOT determine __________. A. whether a chemical is effective or not B. the resistance of a bacterial pathogen to a drug C. bactericidal versus bacteriostatic properties of a drug D. the susceptibility of the bacterial pathogen to a drug 3. Which antibiotic would you use to treat patients with life threatening conditions, but you don’t know which microbe is the pathogen? A. A narrow spectrum antibiotic. B. A broad spectrum antibiotic. C. You need to wait to determine the pathogen first, before making the decision. D. A semisynthetic antimicrobial.
Adi S.
38) Which of the following classification methods relies on the morphology of organisms? A) biochemical tests B) analysis of nucleic acids C) serological tests D) phage typing E) physical characteristics 39) The kingdoms included in the Linnaeus system of classification are A) Fungi and Protista. B) Prokaryotae and Protista. C) Animalia and Prokaryotae. D) Animalia and Plantae. E) Protista and Plantae. 40) Why have some microbiologists proposed using ribosomal RNA as the basis for defining bacterial species? A) The "interbreeding population" criterion does not apply to bacteria. B) Bacteria vary too little in their physical and biochemical traits. C) Ribosomal RNAs are highly conserved genetic sequences present in all prokaryotes. D) Ribosomal RNA is the basis for domain assignment. E) Bacteria are not interbreeding populations, and ribosomal RNAs are highly conserved genes present in all prokaryotes. 41) Who discovered penicillin? A) Fleming B) Ehrlich C) Domagk D) Pasteur E) Kitasato 42) The work of _______ on fermentation led to the discovery that enzymes are responsible for the chemical reactions that occur in cells. A) Buchner B) Lister C) Pasteur D) Woese E) Koch 43) The principle of disinfection to reduce HAIs (healthcare associated infections) among patients was initially introduced by A) J. Snow and R. Koch. B) E. Jenner and L. Pasteur. C) I. Semmelweis and J. Lister. D) L. Pasteur and R. Koch. E) P. Ehrlich and A. Fleming. 44) The use of chemical agents to harm or kill microbes is A) chemotherapy. B) immunology. C) biotechnology. D) serology. E) epidemiology.
Dr. Anas S.
The larger the therapeutic index, the better the chemotherapeutic agent. Which of the following is an antibiotic? Ampicillin, Ciprofloxacin, Sulfonamide, Penicillin, all of the above. Which of the following tests is not used to determine the minimal lethal concentration? E-test strips, Agar dilution test, Dilution susceptibility tests, none of the above, all may be used. The most selective antibiotics are those that interfere with the synthesis of bacterial DNA, bacterial RNA, bacterial cell walls, bacterial plasma membrane. Quinolones are antimetabolites, bacteristatic, broad-spectrum, narrow-spectrum. Which antibiotic has a beta-lactam ring? Cephalosporin, Penicillin, Tetracycline, Chloramphenicol. Patients with penicillin allergies are frequently allergic to another class of antibiotics. Which one? Cephalosporins, Macrolides, Aminoglycosides, Fluoroquinolones. Which of the following is not a mechanism of action for an anti-viral drug? killing extracellular viruses, stopping virus synthesis, inhibiting virus maturation, blocking virus receptors. The highest degree of selective toxicity would be exhibited by an antimicrobial whose mechanism of action interrupting ribosomal function, dissolving the cell membrane, preventing cell wall synthesis, inhibiting DNA replication. Which of the following would be least effective against a gram negative? a beta lactam, polymixin, a macrolide, a glycopeptide.
Madhur L.
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