6 Staphylococci can readily be differentiated from streptococci in that: a) Gram
ID: 132604 • Letter: 6
Question
6 Staphylococci can readily be differentiated from streptococci in that: a) Gram stain smear will show different arrangements d) Only A and C above Only A and B above 7) Characteristics associated with virulent staphylococci include Coagulase-positive b) Fermentation of mannitol e) Beta type hemolysis on blood agar d) All of the above e) Only A and C above 8An encapsulated bacterium can be virulent becasse the capsule b. Helps the bacterium attach. c. Destroys host tissues d. Interferes with physiological processes Many pathogens don't have capsulen; therefore, capsules do not contribute to 49) The direct cause of the symploms of tetanus is: Endotoxin b) Exotoxin Toxic effect of the cells d) Hemolysins e None of the above 0 Semisynthetie penicillins differ from natural penicillins in all of the following except semisynthetie penicillins are Broad spectrum. .Resistant to penicillinase. c. Reaistant to stomach acids d. Bacterieidal e. None of the above.Explanation / Answer
Answer=
46]Staphylococci can readily be differentiated from streptococci in that
c] streptococci are catalase-negative
explaination - catalase test used for the identification of Staphylococci & streptococci .
streptococci are catalase-negative whereas staphylococci are gram positive bacteria.
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47]Characteristics associated with virulent staphylococci include:
d]All of the above
explaination- most pathogenic species of staphylococci unique lab characteristics:
i.e.Coagulase positive.-converts fibrinogen to fibrin.
ferments mannitol i.e. S.aureus growth on mannitol-salt agar.
on blood agar shows golden colonies ,beta-hemolytic.
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48]encapsulated bacterium can be virulent because capsule
a]Resists phagocytosis
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