Staphylococci can readily be differential from streptococci in that: a) Gram sta

Question

Staphylococci can readily be differential from streptococci in that: a) Gram stain smear will show different arrangement 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 staphylococci include: a) Coagulase-positive b) Fermentation of mannitol c) Beta type hemolysis on blood agar d) All of the above e) Only A and C. above The basic lesion produced by staphylococci is: a) Abscess b) Ulcer c) Varicose veins d) Impetigo e) None of the above The direct cause of the symptoms of tetanus is: a) Endotoxin b) Exotoxin c) Toxic effect of the cells d) Hemolysins e) None of the above Clostndium tetani is commonly found in: a) Soil b) Dust c) Feces d) All of the above e) Only A and B above

Explanation / Answer

46. B

All staphylococci can be differentiated from all streptococci because only staphylococci produce the enzymes catalase that is easily detected in the lab.

47. A

Most autogenic species of staphylococcus show all these characteristics -coagulase positive( converts fibrinogen to fibrin), ferments mannitol( grow on mannitol- salt agar) and form golden colonies on blood agar by beta- hemolysis.

48. D

Staphylococci cause skin lesions and localised abscesses. Impetigo is typically caused by staphylococcus aureus Streptococcus pyogenes.

49. B

Tetanus is caused by the clostridium tetani bacterium which are mostly found in animal manure and contaminated soil. They release tetanospasmin neurotoxin which enters the bloodstream and rapidly spreads around the body causing tetanus symptoms.

50. D

Spores of clostridium tetani are found everywhere in soil, dust, animal intestine and animal faeces.

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