A. Dextranase and soluble dextran
B. Insoluble dextan and glucosyl transferase
C. soluble dextan and glucosyl transferase
D. None of the above
Related Mcqs:
- 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 - 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 - The enzyme glucosyl transferase secreted by Streptococcus mutans sythesizes glucans from_____________?
A. Glucose
B. Fructose
C. Sucrose
D. Lactose - Most used selective medium for streptococcus mutans is:____________?
A. Mac conkey medium
B. Mitus salivarius bacitracin agar
C. Nutrient agar
D. Tellurite medium - Streptococcus mutans produces an adhesive polymer from sucrose, known as:__________?
A. Levans
B. Lectins
C. Glucans
D. Polyfructans - 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 - Bacteria responsible for initiation of caries is _________________?
A. Actinomyces
B. Strep. mutans
C. Lactobacillus
D. Strep. viridans - 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 - 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 - 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
