The organism that exhibits characteristic end-over-end tumbling motility when incubated in nutrient broth at room temperature for 1 to 2 hours is:
a. L. monocytogenes.
b. Corynebacterium diphtheriae.
c. Bacillus anthracis.
d. Bacillus cereus group
A
L. monocytogenes can be presumptively identified by observation of motility by direct wet mount. The organism exhibits characteristic end-over-end tumbling motility when incubated in nutrient broth at room temperature for 1 to 2 hours.
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Fill in the blank(s) with the appropriate word(s).
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a. eat undercooked beef. b. walk barefoot in a rice field. c. eat undercooked pork. d. are bitten by mosquitoes. e. eat undercooked fish.
Which of the following does NOT act to maintain the
osmotic gradient necessary for the concentration of urine in mammals? a. countercurrent flow at the loop of Henle b. decreased hypothalamic signals leading to a decrease in ADH production c. impermeability of the descending limb of the loop of Henle to Na+, Cl-, and other solutes d. impermeability of the ascending limb of the loop of Henle to water e. all of these
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a. true b. false