Question

how dextran is formed? Select all that apply.

  

a. the host eats sugar and the host converts the sugars into a carbohydrate

B. the host eats sugar and breaks down the disaccharide to monosaccharides and the monosaccharides form the dextran

C. bacteria consume some of the sugar ingested by the host and break it down to monosaccharides which it re-fashions into dextran.

D. bacteria ferment mannitol which causes an increase in acid production leading to dextran formation.

E. None of the above

Which of the following is a unique characteristic of community acquired methicillin resistant Staphylococcus aureus? Select all that apply.

a.The ability to live on mannitol salt agar and ferment mannitol

b. The ability to make coagulase

C. The ability to inhabit the external nares

D. The presence of a gene known as Panton-Valentine Leukocidin

E. The ability to make catalase

What distinguished the more virulent forms of Staph, such as S. aureus from the less virulent strains?

A. catalase

B. oxidase

C. coagulase

D. mannitol

E. acid fast stain

Answer 1

Question 1.) Answer is C.) Bacteria consume some of the sugar ingested by the host amd break it down by monosaccharides which it re-fashions into dextran. That is with the help of bacterial enzyme detransucrase that cleaves the fructose and form the covalent glycosyl enzyme intermediate which on polymerization (glucose n1 frowing chain) leads to the formation of dextran.

Question 2.) Answer is D.) The presence of a gene known as panton valentine leukocidin (PVL) produces the unique toxin panton valentine leukocidin and B.) The ability to make coagulase that makes it different from other species of staphylococus.

Question 3.) Answer is C.) Coagulase. Stap. Aureus produces varoius coagulase enzyme that has ability to clot the plasma and forms coat over bacterial cells make them more virulent than other species.

Thankyou...