Initiation of caries by streptococcus mutans is by the production of______________?

Related Mcqs:

1. Streptococcus mutans is considered to be principle etiologic agent of caries because it produces organic acids and it ________________?

   A. Forms a gelatinous matrix
   B. Metabolizes substrate from saliva
   C. Derives energy from enamel constituents
   D. Lives symbiolically with lactobacillus

2. S. mutans is involved in dental caries initiation Other bacteria also involved is______________?

   A. S. Sarcinus
   B. S. macae
   C. S. sanguis
   D. S. salivarius

3. The enzyme glucosyl transferase secreted by Streptococcus mutans sythesizes glucans from_____________?

   A. Glucose
   B. Fructose
   C. Sucrose
   D. Lactose

4. Most used selective medium for streptococcus mutans is:____________?

   A. Mac conkey medium
   B. Mitus salivarius bacitracin agar
   C. Nutrient agar
   D. Tellurite medium

5. Streptococcus mutans produces an adhesive polymer from sucrose, known as:__________?

   A. Levans
   B. Lectins
   C. Glucans
   D. Polyfructans

6. All of the following lab tests can be used to distinguish streptococcus mutans from other oral streptococci, except______________?

   A. Gram staining
   B. Fermentation of mannitol and sorbital
   C. Production of intracellular and extracellular adherent polysacharide
   D. Colony morphology on saliva agar

7. Bacteria responsible for initiation of caries is _________________?

   A. Actinomyces
   B. Strep. mutans
   C. Lactobacillus
   D. Strep. viridans

8. What is the PH at which initiation of caries begin ?

   A. 4.3-4.5
   B. 5.2-5.5
   C. 4.9-5.1
   D. 3.5-4.5

9. Smooth surface caries is characterized by spread of caries in enamel and dentin as cones. These alignment in enamel and dentin is____________?

   A. Base to base
   B. Apex to base
   C. Apex to apex
   D. None of the above

10. Progression of dental caries caries on pit and fissure occurs from:

    A. Apex of the pit and fissure
    B. Wide and of the pit and fissure
    C. Lateral surface of the pit and fissure
    D. Bottom of the pit and fissure