Bacterial species which is protective or beneficial to the host is_______________?

Related Mcqs:

1. Which of the following structures, found external to the bacterial cell wall, are involved in bacterial attachment to cell surfaces?

   A. Capsule
   B. Flagella
   C. Pili
   D. Mesosomes

2. The structure in involved in bacterial attachment to cell surface is_______________?

   A. Capsule
   B. Fimbria
   C. Flagella
   D. None of the above

3. The protective effects breast milk are known to be associated with______________?

   A. IgM antibodies
   B. Lysozyme
   C. Mast cells
   D. IgA antibodies

4. The presence of Which of the following factors in viruses makes protective vaccines a possibility ?

   A. Enzymes
   B. Protein coat
   C. Polysaccharide
   D. Lipids

5. For uniform staining reaction, morphology and biochemical activity it is advisable to study bacterial cultures during the_____________?

   A. Lag phase
   B. Death phase
   C. Stationary phase
   D. Logarithmic phase

6. A protoplast is best characterized as a bacterial cell______________?

   A. with a cell wall but free of a capsule
   B. containing a cell wall and a capsule
   C. Free of a cell wall and a capsule
   D. Uniquely sensitive to penicillin

7. Electron microscopic examination of the bacterial flora of necrotising ulcerative gingivitis indicates the presence of microorganisms within non-necrotic tissues in advance of other bacteria. The organisms involved are______________?

   A. Cocci
   B. Spirochetes
   C. Bacteriophages
   D. Filamentous rods

8. The following are applicable to bacterial genoms except________________?

   A. It is composed of DNA
   B. It doe not contain histones
   C. It is circular
   D. Its DNA has both introns and extrons

9. The bacterial cell wall has all of the following properties except______________?

   A. It consists of a mixed polymer called peptidoglycon
   B. It is the structure principally responsible for the reaction of gram staining
   C. It is a unique flexible plastic structure
   D. It contains D-isomers of amino acids

10. Subacute bacterial endocarditis is caused by_____________?

    A. Streptococcus viridans
    B. Haemolytic streptococci
    C. Staphylococcus aureus
    D. Nisseria