Which line best depicts a strict anaerobic cell incubatedaerobically? a. A b. B

Question

Which line best depicts a strict anaerobic cell incubatedaerobically?    a. A    b. B    c. C Which line best illustrates a mesophile at 15o Cabove its optimum temperature?    a. A    b. B    c. C This data indicates that S. aureus is a(n)    a. mesophile.    b. facultative anaerobe.    c. haloduric.    d. aerobe.    e. osmophile. The following data were obtained by incubating the bacteria innutrient medium + disinfectant for 25 hr, then transferring oneloopful to nutrient medium (subculturing). A - - - means no growthwhile + means growth. Which disinfectant is the least effective at stoppingbacterial growth    a. Doom    b. K.O.    c. Mortum    d. Sterl    e. Can't tell Which disinfectant was bactericidal?    a. Doom    b. K.O.    c. Mortum    d. Sterl    e. Can't tell

Explanation / Answer

1. Your lines on the graph indicate growth rates. A is rapidgrowth, B is moderate growth, C is no growth. A strict anaerobewould not grow in an an aerobic incubation, so its curve would beC. 2. A mesophile thrives in moderate temperatures and theoptimum would be the midrange of what it can tolerate. If it isgrown at 15 degrees celsius above its optimum, this would be justoutside of its tolerance, so it would show minimal or no growth,also C. 3. Your bug lives best without NaCl, but can tolerate it, soit is haloduric, C. 4. The disinfectant least effective at stopping growth is KO,B, because it shows growth in both the original culture and thesubculture. 5. Appropriately named mortum is bactericidal, as nothing grewin it. (C)

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