TruePartially lysed red blood cells under and around a colony on sheep blood agar appearasa green discoloration.a blue discoloration.a clear zone.no change in the agar.a green discoloration.Streptococci are Gram positive cocci that:arrange microscopically in pairs or chainsproduce raised, pigmented colonies on sheep blood agarare catalase positiveare obligate anaerobesarrange microscopically in pairs or chainsWhich of the following tests should performed for initial differentiation of Listeriamonocytogenes from group B streptococci?Gram stain, motility at room temperature, catalaseGram stain, CAMP test, H2S/TSIOxidase, CAMP test, glucoseOxidase, bacitracinGram stain, motility at room temperature, catalaseA Corynebacterium species recovered from a throat culture is considered a pathogenwhen it produces:A pseudomembrane of the oropharynxAn exotoxinGray-black colonies on potassium tellurite mediaAll of the aboveAll of the aboveThe organism that exhibits characteristics end-over-end tumbling motility whenincubated in nutrient broth at room temperature for 1 to 2 hours is:
