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Which of the following does not function by inhibiting cell protein synthesis?a. aminoglycosidesb. macrolidesc. penicillind. tetracyclines
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C. penicillin
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Over decolorization in performing a gram stain will result in:a. a gram pos organism appearing gram negb. a gram neg will appear gram posc. it is impossible to overdecolorize
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A. a gram pos organism will appear gram neg
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A solution containing 1-2 x 10^8 CFU/ml should give the same turbidity appearance as:a. 1.0 McFarlandb. 0.5 McFarlandc. 1.5 McFarlandd. 1-2 McFarland
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B. 0.5 McFarland
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The triple sugar iron agar presented the following results after incubation of an inoculum, red slant with a yellow butta. glucose fermentation onlyb. lactose and sucrose fermentationc. glucose and sucrose fermentationd. glucose and sulfur production
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A. glucose fermentation only
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Colonies that grow on thayer-martin agar after 48hrs are gram neg diplococci. Which genus does this media isolate?a. staphylococcusb. streptococcusc. neisseriad. escherichia
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C. neisseria
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A physician suspects taht a urinary tract infection is caused by streptococcus enterocoloitica (a gram pos cocci). Which of the following media would aid in selecting for the growth of this organism?a. PEAb. eosin mehtylene bluec. selenite F brothd. sheep blood agar
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A. PEA
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Which of the following media would aid the technologist in determining if gram neg bacillli were lactose fermenters?a. macconkeyb. blood agarc. chocolate agard. trypticase soy broth
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A. macconkey
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Which of the following stains would you use to id a strain of bacteria that has a cell wall containing long-chain fatty acids:a. acid fastb. gram stainc. new methylene blued. phenyl red
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A. acid fast
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Some organisms produce an extracellular protein that acts with beta-lysin of staph aureus to cause an enhanced lysis of RBCs, the test to test for this factor is:a. CAMPb. catalasec. cetrimided. decarboxylase
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A. CAMP
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The MIC result recorded in antimicrobial testing can be defined as:a. the max conc of antimicrobial agent that should be used for optimal therapyb. the min conc of antimicrobial agent that should be used for optimal therapy.c. the lowest antimicrobial agent conc that completely inhibits visible bacterial growthd. the highest antimicrobial agent concentration that completely inhibits visible bacterial growth
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C. the lowest antimicrobial agent conc that completely inhibits visible bacterial growth
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In the disk diffusion method of antimicrobial susceptibility testing, what is the standard agar base medium for testing most bacterial organisms?a. blood agarb. Mueller-hinton agarc. Mueller-hinton brothd. BHI broth
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B. Mueller-hinton agar
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The min bactericidal conc (MBC) test involves:a. 95.5% reduction in CFU/ml compared with the organism conc in the original inoculumb. 89.9% reduction in CFU/ml compared with the organism conc in the original concc. 99.9% reduction in CFU/ml compared with the organism conc in the original inoculums
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C. 99.9% reduction in CFU/ml compared with with the organism conc in the original inoculum
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A gram pos cocci that grew as a large, creamy yellow, beta-hemolytic colony on blood agar and was catalase and coagulase positive is most likely:a. St. epib. St. aureusc. Strep. pyogenesd. Strep hemolyticus
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B. staph aureus
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Catalase production by an organism is indicated by:a. production of oxygen when the organism is mixed with serumb. production of oxygen when the organism is mixed hyrogen peroxidec. production of clots when an organism is mixed with serumd. production of clots when an organism is mixed with hydrogen peroxide
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B. produciton of oxygen when the organism is mixed with h2o2
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A pos slide soagulase test indicates the production of:a. free coagulaseb. bound coagulasec. catalased. oxidase
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B. bound coagulase
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