Oral Microbiology Test 0% 0 votes, 0 avg 144 You will have 60 minutes to complete all the questions. After the timer reaches 60 minutes, the exam will end and be saved automatically. Good luck! *Fingers crossed* The timer has been reached. The exam has now been terminated and saved. Oral Microbiology Test 1 / 60 Which of the following statements on Actinomycetes are not true? a. Short rods, but often pleomorphic b. It causes chronic granulomatous infections c. It infrequently causes actinomycoses of the jaws after tooth extractions d. It is a eukaryote 2 / 60 AIDS virus is ? a. Retro virus b. DNA virus c. RNA virus d. Enterovirus 3 / 60 Certain strains of Streptococcus mutans? a. Cause dental caries by the production of lactic and other acids, from fermentation of sugars b. Extracellular glucan production. c. Are cause of infective meningitides d. Cause of periodontal disease by the production of lactic and acids from fermentation of sugars 4 / 60 Fusobacterium Nucleatum π a. Produce proinflammatory cytokines and up-regulating the inflammatory response b. Gram-positive, strictly anaerobic c. Non capsulate diplococci d. Isolated from monomicrobial infections 5 / 60 Main causative organism of chicken pox is? a. Fox virus b. Measles virus c. Mumps virus d. Varicella Zoster virus 6 / 60 Which microorganism implicated in pit and fissure caries? a. Streptococcus mutans b. Streptococcus mitis c. Actinimyces viscosus d. Staphylococcus aureus 7 / 60 Which of the following statements on Prevotella Intermedia are true:? a. Implicated in periodontal disease in association with P. gingivalis b. Implicated in dental Caries in association with Aggregatibacter actino- mycetemcomitans. c. Microaerophilic d. Black pigmented Gram-positive 8 / 60 Primary herpesvirus infections may cause:? a. Herpes labialis b. Herpes zoster c. Meningititis d. Herpetic gingivostomatitis 9 / 60 Acute necrotizing ulcerative gingivitis (ANUG) or trench mouth is caused by a mixed bacterial infection such as? a. Fusobacterium nucleatum and Streptococcus mutans b. Fusobacterium nucleatum and Actinomyces viscosus c. Fusobacterium nucleatum and Spirochetes d. Staphylococcus aureus and Streptococcus mutans 10 / 60 Specificity of Anaerobic bacteria, except:? a. Grow on anaerobic media culture b. Foul odor when opening anaerobic jar or bag c. Incubation culture in 1-2 days d. Black pigmentation on culture 11 / 60 Bacteria usually cause Pericoronitis? a. Fusiform bacillus , Provetella, Eikenella corrodens and Capnocytophaga sputigen b. Fusiform bacillus, Eikenella corrodens, Alpha-hemolytic Streptococci and Capnocytophaga sputigena c. Borrelia vincentii, Bacterioides, Provetella and Eikenella corrodens d. Alpha-hemolytic Streptococci, Provetella, Bacterioides and Capnocytophaga 12 / 60 Major bacteria usually cause dental caries:? a. Mutans Streptococci, Staphylococcus aureus, Actinomyces vicosus b. Streptococcus pneumoniae, Lactobacilli, Actinomyces vicosus c. Mutans Streptococci, Lactobacilli, Actinomyces vicosus d. Mutans Streptococci, Lactobacilli, Clostridium 13 / 60 A bacterium that never found in tooth surface:? a. Streptococcus mutans b. Streptococcus mitis c. Streptococcus anginosus d. Streptococcus pneumoniae 14 / 60 Principal Cocci Gram positive bacteria found in oral cavity:? a. Neisseria b. Veillonella c. Peptostreptococcus d. Moraxella 15 / 60 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, Antimicrobial Susceptibility testing, Culture , Identification , c. Antimicrobial Susceptibility testing, Direct examination , Gram stain, Culture , Identification , d. Direct examination , Gram stain, Culture , Identification , Antimicrobial Susceptibility testing 16 / 60 Strategy to control of biofilm pH in oral biofilm:? a. Inhibition of key microbial enzyme b. Antiflammatory agents c. Fluoride d. Generating nutrients 17 / 60 Factor that does not influence to dental caries? a. Duration and frequency of exposure b. Size and form of teeth c. Individual factor d. Substrate for microorganisms 18 / 60 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. 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 c. 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 d. 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 19 / 60 The comment bacterium causes dental caries:? a. E.coli b. Staphylococcus aureus c. Pseudomonas aeruginosa d. Mutans Streptococci 20 / 60 Antimicrobial against Porphyromonas gingivalis is π a. Kanamycin b. Metronidazole c. Erythromycin d. Vancomycin 21 / 60 Antibiotic which is common use to treat anaerobic bacteria π a. Metronidazole b. Vancomycin c. Gentamicin d. Colistin 22 / 60 The most common bacterium that is responsible for tonsillitis and pharyngitis is:? a. Streptococcus mutans b. Group-B beta hemolytic Streptococcus ( Streptococcus agalactiae) c. Group-A beta hemolytic Streptococcus ( Streptococcus pyogenses) d. Streptococcus mitis 23 / 60 αα»αααΆααααα menbrame cytoplasmique ? a. ααΆαααΆαααα½αααααΆααα’ααααΆαααΆαα»ααααΆαα αα αα·α α αΌαααΆαααΆαα’αα»ααααΆαααααααΆ b. ααΆαααΆαα»αααααααα’αΆα αααααα αΌαααΆαααΌα αααα acide c. ααΆαααΆαα»ααααααααΌα menbrame αααααα αααα αα·α d. All are corrects e. ααΆαααΆαα»ααααααααΌα menbrame α’αα»ααααΆαα·α’ααα ααα αΌαααΌα ααΆααΉαα 24 / 60 ααααααΎ Microscope Γ©lectronique αααααα»αααΆαααααΆαααααΆα αβ ααα’αΆα ααΎαααΎα ααΌααα ααΆαααααααα αα·α α ααα»α ααααΌα α αβ αα·ααααα αα·αα·ααα π a. ααΈα αααΆ (mobilitΓ© ) ααΌαααΆα ( forme ) b. ααΆααααααΈ Grams positif c. ααΆααααααΈ Grams positif α¬ Grams nΓ©gatif d. αααααΆαααΆαα- αα»ααααα½αααΆααααααΈ 25 / 60 ααΆαα αααΎαααααα½αααΆααααααΈααααΎααΆαααΌαααΆαααα pH? a. pH 6-6.5 b. pH : 8-9 c. pH : 7-7.5 d. pH : 9-10 26 / 60 ααΆααααααΈααΆαααΌαααΆαααΌαααααΆαααΈααα? a. Spirillum (spirals ), Coccus (sphere) ,Bacillus(rods) b. Helical, Icosahedral, Complex c. Icosa,hedral, Complex, Coccus (sphere) d. Complex Helical,Bacillus(rods) 27 / 60 Paroi bacterie gram nΓ©gatif ααΆααααααα? a. ααααΎα α’αΆαααα»ααα·αα’αΆα ααααΆαα αΌαααΆα b. ααααΆαα α’αΆαααα»αα’αΆα ααααΆα α αΎα bactΓ©rie αααααα c. ααααΎα α’αΆαααα»αα’αΆα ααααΆαα αΎα bactΓ©rie αααααα d. ααααΎα α’αΆαααα»αα’αΆα ααααΆα α αΎα bactΓ©rie ααααααα α 28 / 60 αααα»αααΆαααααΆαα αΌαααα αααΈα’αΆα αΆαααααααΆααααααΈ permΓ©ase ααΆαααα»ααααΆαααααααβ ? a. 5αααααα b. 4αααααα c. 3αααααα d. 6αααααα 29 / 60 ααα·ααΆαα αααΈα’αΆα αΆαααααΆααααααααααααΈαα·αααΆααααααΈα α ααΆ? a. ration de crosissance and Ration dβentretien b. Ration dβentretien c. Ration totale d. ration de crosissance 30 / 60 αα½αααΆααααααΈ pseudomonas α’αΆα ααααα αααα»α milieu ? a. milieu base b. milieu acide c. All are corrects d. milieu acide + base 31 / 60 ααα ααααΈααααΌαααΆααααααααΌαααΆαα»αααα»αααααΌαααΆααα·α ααΆα? a. Ca , Mg , K, S , P , Fe b. Ca . Mg . K c. C. H . O2 .Z d. S . P . Fe 32 / 60 virusααΆαααα αααΌα ααΆα ααΆααααααΈα ααα½α ? a. α©α α αα b. α¨α α αα c. α‘α α α αα d. α’α α α αα 33 / 60 ααΆααααααΈαααααα psychrophile α’αΆα ααααα αααα»αααΈαα»ααα ααΆαααΆααααα? a. ααααα 40 ΛC b. ααΎαααΈ 20 ΛC c. ααααα 20 ΛC d. ααΎαααΈ 30 ΛC 34 / 60 ααα ααααΈααααΌαααΆα (Les besoins nutritifs ) ααααααΆααααααΈαααααααΌαααΆαα»αααα»αααα·ααΆαα αααΎαααΆα? a. Carbon(C). HydrogΓ¨ne(H).Azote(N) +O2 . phosphore (P) Fer (Fe) b. Carbon(C). HydrogΓ¨ne(H) .Azote (N) .oxygΓ¨ne(O) c. Ca . Mg. K d. phosphore (P) Fer (Fe) . Ca . Mg. K 35 / 60 ααΆααααααΈαααααα cryophile α’αΆα ααααα αααα»αααααααααΈαα»ααα ααΆα? a. 6 ΛC b. 8 ΛC c. 10 ΛC d. 4 ΛC 36 / 60 ααα·ααΆαα αααΈα’αΆα αΆαααααΆααααΆαααααα·α ααΎααααΈααΆαααα α ααΆ? a. Ration dβentretien b. Ration dβentretien and Ration totale c. ration de croissance d. Ration totale 37 / 60 ααΆααααααΈαααααα·αααααα’ααααΆαααααΊ ( non pathogΓ©ne ) α’αΆα ααααα αααα»αmilieu? a. milieu base ααααΆα acide ααααΆα b. milieu acide + base c. milieu acide d. milieu base 38 / 60 Paroi ααααΆααααααΈ Gram negatif ααααα‘αΎαααα? a. urΓ©ine+gelatin b. cΓ©ramique c. gelatin d. Mucopeptide 39 / 60 Widely accepted theory of dental caries is π a. Proteolytic theory b. Proteolytic chelation theory c. Autoimmune theory. d. Acidogenic theory 40 / 60 True about caries, all EXCEPT:? a. Chronic endogenous infection b. Demineralization of enamel. c. Microorganisms play the most essential role d. Not due to microorganisms 41 / 60 Mouthwashes used for controlling oral malodor should contain? a. Xylitol. b. Antibacterial agent c. Alcohol d. Sugar to make them more palatable to consumers 42 / 60 Which of the following statements on chronic periodontitis is INEXACTE? a. Morbidity 70β80% b. 95% of all periodontal diseases. c. Most prevalent disease globally d. Prevalence and severity decrease with age 43 / 60 Main predisposing factors of acute necrotizing ulcerative gingivitis is:? a. Host factors b. Dental caries c. Severe malnutrition d. Intake of fermentable carbohydrates. 44 / 60 Demineralization of inorganic portion and destruction of organic of tooth is known as:? a. Dentinal caries b. Pulpitis. c. Dental caries d. Enamel caries 45 / 60 Viruses can be cultivated in? a. Broth b. Blood culture. c. Lab media d. Tissue culture 46 / 60 The organisms which can grow best in the presence of a low concentration of oxygen? a. Anaerobic. b. Microaerophilic c. Aerobic d. Aerophilic 47 / 60 The peak incidence of juvenile periodontitis in children occurs at ages:? a. 1-3 years b. 10-13 years. c. 5-7 years d. Birth-6 months 48 / 60 An example of a nonspecific chemical barrier to infection is…? a. unbroken skin b. cytotoxic T cells. c. cilia in the respiratory tract d. lysozyme in saliva 49 / 60 Chronic periodontitis is characterized by INEXACT:? a. tooth mobility and migration b. absence of pain in general. c. systemic symptoms like fever d. gingival recession 50 / 60 Which of the following statements on periodontal disease is INEXACT? a. Can be controlled by using mechanical cleansing techniques. b. One of major diseases afflicting humankind c. Manage by restoration d. Disorders of supporting structures of teeth 51 / 60 Probiotics exhibit all BUT the following characteristics:? a. Have beneficial effect on host. b. Nontoxic and nonpathogenic to host c. Mimic antibiotics d. Remain viable for a long time 52 / 60 Gram staining reflects in bacteria? a. presence or absence of nucleus. b. differences in bacterial metabolism c. differences in the cell wall structure d. differences in the bacterial plasmatic membrane 53 / 60 Microorganism that can grow in the presence as well as in the absence of molecular oxygen is? a. obligatory aerobic b. microaerobically c. facultatively anaerobic. d. obligatory anaerobic 54 / 60 There are many different types of bacteria normally present in the oral cavity. Which of the following is the name of the one most likely to be associated with the onset of dental caries? a. Bacteroides b. Spirochaetes c. Streptococcus. d. Staphylococcus 55 / 60 The main difference in true bacteria and mycoplasma is that it does not posses:? a. ATP synthesis b. Cell wall c. Flagella d. A capsule. 56 / 60 Dentoalveolar abscess is treated by:? a. Drainage through the gingival sulcus or by an external incision. b. Gingivoplasty c. Gingivectomy d. Periodontal flap procedure 57 / 60 Members of the genus Lactobacillus are normal microflora of the? a. Nasopharynx. b. Skin c. Hair d. Mouth 58 / 60 What are the predominant plaque bacteria in gingivitis? a. Anaerobic cocci (+) and Facultative anaerobia cocci rods (+) b. Anaerobic cocci (-) and Facultative anaerobia rods (-). c. Facultative anaerobia cocci (-) and Anaerobic rods (-) d. Facultative anaerobia cocci (+) and Anaerobic rods (-) 59 / 60 Which of the following statements on clinical sign of chronic periodontitis is INEXACTE? a. Inflamed, red, shiny and bleeding gingivae. b. Gross gingival inflammation, fibrosis and some shrinkage c. Tooth mobility and migration d. Irregular alveolar bone loss around teeth 60 / 60 Which of the following statements on the natural history of periodontal disease is INEXACT? a. Gram-positive cocci predominate in healthy gingival crevice b. facultative anaerobes predominate in gingivitis. c. the proportion of Gram positive rods decreases to nearly 5% in chronic marginal gingivitis d. Gram-negative anaerobes predominate in chronic periodontitis Your score isThe average score is 86% Facebook 0% Restart quiz Any comments? Send feedback
