/44 0 Oral Microbiology Preparation (Dr. Hem Sopheak) 1 / 44 1) A bacterium that spread from lung infection and cause oral lesions with clinical sign include fever, chills, fatigue and malaise, weight loss, and persistent cough π a. Klebsiella pneumoniae b. Mycobacterium tuberculosis c. Pseudomonas aeruginosa d. Streptococcus pneumoniae 2 / 44 2) Steps in order to perform bacteriological diagnostic of oral microbiology:? a. Identification , Direct examination , Gram stain, Culture , Antimicrobial Susceptibility testing b. Direct examination , Gram stain, Culture , Identification , Antimicrobial Susceptibility testing c. Antimicrobial Susceptibility testing, Direct examination , Gram stain, Culture , Identification , d. Direct examination , Gram stain, Antimicrobial Susceptibility testing, Culture , Identification , 3 / 44 3) Bacteria usually cause Pericoronitis? a. Alpha-hemolytic Streptococci, Provetella, Bacterioides and Capnocytophaga b. Borrelia vincentii, Bacterioides, Provetella and Eikenella corrodens c. Fusiform bacillus, Eikenella corrodens, Alpha-hemolytic Streptococci and Capnocytophaga sputigena d. Fusiform bacillus , Provetella, Eikenella corrodens and Capnocytophaga sputigen 4 / 44 4) A major bacteria that is responsible in facilitating adhesion by other bacteria is:? a. Staphylococcus stains b. Enterococcus stains c. Fusobacterium nucleatum d. Streptococcus strains 5 / 44 5) Principal Cocci Gram negative bacteria found in oral cavity:? a. Gemella b. Veillonella c. Enterococcus d. Streptococcus 6 / 44 6) Specificity of Anaerobic bacteria, except:? a. Foul odor when opening anaerobic jar or bag b. Grow on anaerobic media culture c. Black pigmentation on culture d. Incubation culture in 1-2 days 7 / 44 7) Which bacteria that is not presence in buccal mucosa? a. Streptococcus anginosus b. Treponema palidum c. Streptococcus mitis d. Streptococcus mutans 8 / 44 8) Which bacteria that is not always presence in saliva:? a. Streptococcus agalactiae b. Streptococcus salivarius c. Streptococcus oralis d. Streptococcus mitis 9 / 44 9) Pathway in order of pathogenesis of oral infection:? a. Pus formation- Entry of bacteria into soft tissue wall or trauma to the orifice – Formation of infiltrate- Destruction of connective tissues- Decrease tissue resistance and increase number of bacteria with virulence b. Decrease tissue resistance and increase number of bacteria with virulence- Entry of bacteria into soft tissue wall or trauma to the orifice – Formation of infiltrate- Destruction of connective tissues- Pus formation c. Entry of bacteria into soft tissue wall or trauma to the orifice – Pus formation- Formation of infiltrate – Destruction of connective tissues – Decrease tissue resistance and increase number of bacteria with virulence d. Entry of bacteria into soft tissue wall or trauma to the orifice – Formation of infiltrate- Destruction of connective tissues- Pus formation- Decrease tissue resistance and increase number of bacteria with virulence 10 / 44 10) Among 4 phases of biofilm formation, the phase that is done the longest, about 7-14 days is:? a. Phase 4 b. Phase 3 c. Phase 1 d. Phase 2 11 / 44 11) Factor that does not influence to dental caries? a. Substrate for microorganisms b. Individual factor c. Size and form of teeth d. Duration and frequency of exposure 12 / 44 12) Dental caries, which answer is incorrect? a. Characterized by demineralization of the inorganic portion b. Multifunctional microbial disease c. Calcified tissues of the teeth d. Increased of the organic substance of the tooth 13 / 44 13) Major bacteria usually cause dental caries:? a. Streptococcus pneumoniae, Lactobacilli, Actinomyces vicosus b. Mutans Streptococci, Lactobacilli, Actinomyces vicosus c. Mutans Streptococci, Lactobacilli, Clostridium d. Mutans Streptococci, Staphylococcus aureus, Actinomyces vicosus 14 / 44 14) The comment bacterium causes dental caries:? a. Pseudomonas aeruginosa b. E.coli c. Mutans Streptococci d. Staphylococcus aureus 15 / 44 15) A bacterium that never found in tooth surface:? a. Streptococcus anginosus b. Streptococcus mutans c. Streptococcus mitis d. Streptococcus pneumoniae 16 / 44 16) The most common bacteria that are always presence in mouth as a normal flora, which proposition is inexact? a. D. Gonococcus b. A. Streptococcus c. C. Prevotella d. B. Actinomyces 17 / 44 17) Principal Cocci Gram positive bacteria found in oral cavity:? a. Neisseria b. Moraxella c. Veillonella d. Peptostreptococcus 18 / 44 18) Principal Rods Gram positive bacteria found in oral cavity:? a. Prevotella b. Eikenella c. Simonsiella d. Actinomyces 19 / 44 19) Antibiotic which is common use to treat anaerobic bacteria π a. Metronidazole b. Gentamicin c. Colistin d. Vancomycin 20 / 44 20) Among 4 phases of biofilm formation, the phase that is done immediately about 4 hours is:? a. Phase 3 b. Phase 2 c. Phase 1 d. Phase 4 21 / 44 21) In dental caries, the protective factor is π a. Acid producing bacteria b. Antibacterials ( fluorides, Chlorhexidine, Xylitol) c. Poor oral hygiene d. Frequent eating / drinking of fermentable carbohydrates 22 / 44 22) Principal Rods Gram negative bacteria found in oral cavity:? a. Eubacterium b. Lactobacillus c. Porphyromonas d. Corynebacterium 23 / 44 23) Analytical techniques for monitoring biofilms by βIndirect detectionβ π a. High Pressure Liquid Chromatography (HPLC) b. Detection of proteins by molecular biology technique c. Detection of DNA by molecular biology technique d. Microscopy techniques 24 / 44 24) Major bacteria cause chronic periodontitis:? a. Fusobacterium nucleatum, Porphyromonas endodontalis, Prevotella tannerae,Stphylococcus aureus b. Fusobacterium nucleatum, Porphyromonas endodontalis, Prevotella tannerae, Pseudomonas aeruginosa c. Fusobacterium nucleatum, Porphyromonas endodontalis, Prevotella tannerae, E.coli d. Fusobacterium nucleatum, Porphyromonas endodontalis, Prevotella tannerae, Streptococcus anginosus 25 / 44 25) Infection in oral cavity by oral flora, which proposition is inexact? a. Changes in exposure to antiseptic b. Changes in the immune system c. Changes in salivary flow d. Administration of antibiotics 26 / 44 26) On tooth surface, bacteria that participate actively in adhesion of primary colonizers? a. Streptococcus stains b. Pseudomonas stains c. Staphylococcus stains d. Enterococcus stains 27 / 44 27) Infections of the mucosa are more usually associated with transient oral bacteria, which one is incorrect? a. Enterococcus b. Staphylococcus c. Pseudomonas d. Helicobacter 28 / 44 28) Bacteria usually cause Necrotizing Ulcerative Gingivitis? a. Fusiform bacillus and Borrelia vincentii b. Borrelia vincentii and Eikenella corrodens c. Fusiform bacillus and Capnocytophaga sputigena d. Borrelia vincentii and Porphyromonas endodontalis 29 / 44 29) Analytical techniques for monitoring biofilms by βDirect detectionβ π a. Inductively Coupled Plasma Mass Spectrometry (ICP-MS) b. High Pressure Liquid Chromatography (HPLC) c. Gas Chromatography – Mass Spectrometry (GC-MS) d. Microscopy techniques 30 / 44 30) Strategy to control of biofilm pH in oral biofilm:? a. Antiflammatory agents b. Inhibition of key microbial enzyme c. Fluoride d. Generating nutrients 31 / 44 31) Oral opportunistic infection happens when:? a. An organism that usually is nonpathogenic has no opportunity to cause disease b. An organism that usually is nonpathogenic causes disease c. An organism that usually is pathogenic causes disease d. An organism that usually is pathogenic becomes normal flora 32 / 44 32) Antimicrobial against Porphyromonas gingivalis is π a. Erythromycin b. Metronidazole c. Vancomycin d. Kanamycin 33 / 44 33) Microorganisms in oral tissue can cause π a. Only local infection b. Systemic infection c. Local infection d. Both, local and systemic infection 34 / 44 34) Diseases are always found in oral cavity, except π a. Tuberculosis b. Typhoid fever c. Gonococci d. Syphilis 35 / 44 35) Strategy to control of rendox potential in oral biofilm:? a. Stimulate base production b. Inhibition of key microbial enzyme c. Fluoride d. Oxygenating agents 36 / 44 36) A bacterium that is usually found in tongue π a. Clostridium difficile b. Streptococcus pneumoniae c. Staphylococcus epidemidis d. Streptococcus mitis 37 / 44 37) Major bacteria cause periodontitis π a. Fusobacterium nucleatum, Petostreptococcus micros, Streptococci, Pneumococcus b. Fusobacterium nucleatum, Petostreptococcus micros, Enterococcus, Borrela vincenti c. Fusobacterium nucleatum, E.coli, Streptococci, Borrela vincenti d. Fusobacterium nucleatum, Petostreptococcus micros, Streptococci, Borrela vincenti 38 / 44 38) Strategy to control of nutrients in oral biofilm:? a. Inhibition of key microbial enzyme b. Stimulate base production c. Antimicrobial agents d. Fluoride 39 / 44 39) The most common bacterium that is responsible for tonsillitis and pharyngitis is:? a. Group-B beta hemolytic Streptococcus ( Streptococcus agalactiae) b. Streptococcus mutans c. Streptococcus mitis d. Group-A beta hemolytic Streptococcus ( Streptococcus pyogenses) 40 / 44 40) A bacterium from buccal mucosa that can cause lung infection in chronic obstructive pulmonary infections in cystic fibrosis patients is:? a. Pseudomonas aeruginosa b. Mycobacterium tuberculosis c. Streptococcus pneumoniae d. Klebsiella pneumoniae 41 / 44 41) Major bacteria cause aggressive periodontitis? a. Capnocytophaga sputigena, Fusobacterium nucleatum, Porphyromonas endodontalis, Prevotella tannerae b. Prevotella intermedia, Fusobacterium nucleatum, Porphyromonas endodontalis, Prevotella tannerae c. Actinobaccilus actinomycetemcomitans, Fusobacterium nucleatum, Porphyromonas endodontalis, Prevotella tannerae d. Eikenella corrodens, Capnocytophaga sputigena, Actinobaccilus actinomycetemcomitans, Prevotella intermedia 42 / 44 42) Steps in order for biofilm formation:? a. Coadhesion , adhesion, colonization, maturation and detachment b. Maturation and detachment, adhesion, colonization, coadhesion c. Colonization , adhesion, coadhesion , maturation and detachment d. Adhesion, colonization, coadhesion , maturation and detachment 43 / 44 43) Biofilm infection is usually found in sites of primary and secondary infection except:? a. Subvenous catheter b. Artificial hip implant c. Genital infection d. Mouth 44 / 44 44) In dental caries, the pathogenic factor is π a. Remineralization ( fluoride, Calcium, Phosphate) b. Good oral hygiene c. Saliva flow and components d. 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