46) Siaphylococci can readily be differentiated from streplococci in that: a) Gr

Question

46) Siaphylococci can readily be differentiated from streplococci in that: a) Gram stain smear will shew different srrmgements b) Streptococci are catalase-negative c) Staphylococci are catalase-negative d) Only A and C above e) Only A and B above Characteristics associated with virulent staphylococei include: a) Coagulase-positive 47) b) Fermentation of mannitol c) Bela type hemolysis on blood agar d) All of the above e) Only A and C. above An encepeulated bacterium can be virulent becanse the capeule: a. Resists phagocytosis b. Helps the beeterium attach. c. Destroys host tissues. d. Interferes with physiological processes. e. Many pathogens don't have capsules; therefore, capaules do net eontribute te 48) 49) The direct cause of the symptoms of tetanus is: b) e) d) Exotoxin Toxic effect of the cells Hemolysins e) None of the above 50) Semiynthetie penicillins differ from nabural penicilins in all of the following except semisynthetic penicillins are: Broad spectrum. b. Resistant to penicillinsse. c. Rexistant to stomach acids. d. Bactericidal. e. None of the above.

Explanation / Answer

46) E.

Both Staphylococci and Streptococci have round, spherical cell shape, but the arrangement of cells is different due to a different binary fission. Staphylococci are catalase positive whereas Streptococci are Catalase negative.

47) D.

48) A. Resists phagocytosis.

49) B. Exotoxin

Tetanus is an acute, often fatal, disease caused by an exotoxin produced by the bacterium Clostridium tetani.

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