Oral Microbiology
Oral Microbiology Quiz
Test your knowledge on oral microbiology with this comprehensive quiz! Dive into various topics including the role of microorganisms in dental diseases, various infections, and viral pathogens. Perfect for dental students, professionals, or anyone interested in the intricacies of oral health.
Get ready to challenge yourself with questions covering:
- Microbial Pathogenesis
- Key Bacterial Species
- Viral Infections
- Dental Health Implications
1. Certain strains of Streptococcus mutans?
Cause dental caries by the production of lactic and other acids, from fermentation of sugars
Are cause of infective meningitides
Cause of periodontal disease by the production of lactic and acids from fermentation of sugars
Extracellular glucan production.
2. Which of the following statements on Actinomycetes are not true?
It is a eukaryote
It causes chronic granulomatous infections
It infrequently causes actinomycoses of the jaws after tooth extractions
Short rods, but often pleomorphic
3. Porphyromonas gingivalis:?
Are Gram-positive pleomorphic rods
Are non-capsulated
Are aggressive periodontal pathogens
Are isolated from many extra oral sites
4. Which of the following statements on Prevotella Intermedia are true:?
Black pigmented Gram-positive
Microaerophilic
Implicated in periodontal disease in association with P. gingivalis
Implicated in dental Caries in association with Aggregatibacter actino- mycetemcomitans.
5. Which microorganism implicated in pit and fissure caries?
Streptococcus mutans
Streptococcus mitis
Staphylococcus aureus
Actinimyces viscosus
6. The organisms most commonly associated with root caries are ?
Fusobacterium Nucleatum
Actinomyces viscosus
Staphylococcus aureus
Porphyromonas gingivalis
7. The virulence of Porphyromonas gingivalis is partly due to?
Proteases, haemolysin and collagenase
Hyaluronic acid
Adhesins
Cytotoxins
8. Fusobacterium Nucleatum :?
Isolated from monomicrobial infections
Produce proinflammatory cytokines and up-regulating the inflammatory response
Gram-positive, strictly anaerobic
Non capsulate diplococci
9. Fusobacterium Nucleatum :?
Plays a crucial role in the beginning of periodontal disease
Implicated in Dental caries
Cause scarlet fever
Black pigmented Gram-negative microorganism
10. Acute necrotizing ulcerative gingivitis (ANUG) or trench mouth is caused by a mixed bacterial infection such as?
Fusobacterium nucleatum and Spirochetes
Staphylococcus aureus and Streptococcus mutans
Fusobacterium nucleatum and Streptococcus mutans
Fusobacterium nucleatum and Actinomyces viscosus
11. Which of the following statement on Actinobacillus actinomycetemcomitans are true?
Aggressive forms of periodontal disease in adolescents
Aggressive forms of dental caries in adolescents
Non-capsulate diplococcic
Cigar-shaped bacilli
12. Actinobacillus actinomycetemcomitans possesses certain virulence factors that enable it to invade tissues, such as ?
Leukotoxin A
Hemolysine
Streptodornas
Hyaluronidase
13. A patient attends the surgery with bilateral swelling of the parotid salivary glands. Which condition are they suffering from?
A. Measles
Mumps
Poliomyelitis
Rubella
14. 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?
Bacteroides
Lactobacillus
Staphylococcus
Streptococcus
15. Elderly patients sometimes present with a fungal infection of the palate, beneath a denture,referred to as denture stomatitis. Which organism causes this condition?
Actinomyces
Candida albicans
Herpes simplex
Staphylococcus aureus
16. Several infections occur in the oral cavity that are of relevance to the dental team. Which of the following infections does virus cause?
Acute necrotizing ulcerative gingivitis
Herpetic stomatitis
Lateral periodontal abcess
Pericoronitis
17. Various viral infections are of relevance to the dental team, including those that cause disease affecting the head neck region. Which one of the following viruses causes cold sores?
Epstein-Barr
Herpes simplex
Herpes zoster
Paramyxovirus
20. Main causative organism of chicken pox is?
Fox virus
Mumps virus
Measles virus
Varicella Zoster virus
21. Toxins or enzymes which are not produced by streptococcus pyogenes?
Hyaluronides
Phosphate
Hemolysin
Streptokinase
22. Causative agent of scarlet fever?
Staphylococcus aureus
Streptococcus viridans
Streptococcus pyogens
None of these
24. Which of the following organisms is most likely to be implicated in dental caries?
Staphylococcus aureus
Staphylococcus epidermidis
Streptococcus sorbinus
Escherichia coli
25. Primary herpesvirus infections may cause:?
Herpetic gingivostomatitis
Herpes labialis
Meningititis
Herpes zoster
26. Epstein-Barr Virus (EBV)?
Betaherpesvirus subfamily of herpesviruses
Achieves latency in sensory ganglia
Cause of infectious mononucleosis
Group A infect: skin and mucous membranes
27. Herpagina is usually cause by?
Hepatitis A virus
Group A coxsackieviruses
Group B coxackieviruses
Cytomegalovirus
28. Coxsakievirus have been found to replicate in the?
Reticuloendothelial system
Submucosal lymph tissue
Small bowel
Sensory nerve
29. Cryptococcosis?
Is an infection caused by Cryptococcus neoformans
Is a localized inflammation around and under the nails
Can cause cardiac abnormalities
Is associated with dog lovers
30. There are some main routes of infection in oral cavity, which one is inexact?
Transferred through the air on dust particles or water droplets
Transferred by hands or objects
Transferred by insects bite.
Required by transient flora
1. Microorganisms in oral tissue can cause :?
Local infection
Systemic infection
Both, local and systemic infection
Only local infection
2. Infection in oral cavity by oral flora, which proposition is inexact?
Changes in salivary flow
Administration of antibiotics
Changes in exposure to antiseptic
Changes in the immune system
3. Oral opportunistic infection happens when:?
An organism that usually is pathogenic causes disease
An organism that usually is nonpathogenic causes disease
An organism that usually is pathogenic becomes normal flora
An organism that usually is nonpathogenic has no opportunity to cause disease
4. The most common bacteria that are always presence in mouth as a normal flora, which proposition is inexact?
A. Streptococcus
B. Actinomyces
C. Prevotella
D. Gonococcus
5. A bacterium that never found in tooth surface:?
Streptococcus pneumoniae
Streptococcus mitis
Streptococcus mutans
Streptococcus anginosus
6. Which bacteria that is not always presence in saliva:?
Streptococcus salivarius
Streptococcus mitis
Streptococcus oralis
Streptococcus agalactiae
7. A bacterium that is usually found in tongue :?
Streptococcus mitis
Staphylococcus epidemidis
Clostridium difficile
Streptococcus pneumoniae
8. Which bacteria that is not presence in buccal mucosa?
Streptococcus mitis
Treponema palidum
Streptococcus mutans
Streptococcus anginosus
9. Principal Cocci Gram positive bacteria found in oral cavity:?
Peptostreptococcus
Moraxella
Veillonella
Neisseria
10. Principal Cocci Gram negative bacteria found in oral cavity:?
Enterococcus
Veillonella
Gemella
Streptococcus
11. Principal Rods Gram positive bacteria found in oral cavity:?
Prevotella
Eikenella
Actinomyces
Simonsiella
12. Principal Rods Gram negative bacteria found in oral cavity:?
Lactobacillus
Corynebacterium
Eubacterium
Porphyromonas
13. Infections of the mucosa are more usually associated with transient oral bacteria, which one is incorrect?
Staphylococcus
Staphylococcus
Pseudomonas
Helicobacter
14. Pathway in order of pathogenesis of oral infection:?
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
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
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
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
15. Dental caries, which answer is incorrect?
Multifunctional microbial disease
Calcified tissues of the teeth
Characterized by demineralization of the inorganic portion
Increased of the organic substance of the tooth
16. Factor that does not influence to dental caries?
Individual factor
Substrate for microorganisms
Duration and frequency of exposure
Size and form of teeth
17. In dental caries, the pathogenic factor is :?
Saliva flow and components
Remineralization ( fluoride, Calcium, Phosphate)
Good oral hygiene
Acid producing bacteria
18. In dental caries, the protective factor is :?
Acid producing bacteria
Frequent eating / drinking of fermentable carbohydrates
Antibacterials ( fluorides, Chlorhexidine, Xylitol)
Poor oral hygiene
19. The comment bacterium causes dental caries:?
Mutans Streptococci
Staphylococcus aureus
E.coli
Pseudomonas aeruginosa
20. Major bacteria usually cause dental caries:?
Mutans Streptococci, Staphylococcus aureus, Actinomyces vicosus
Mutans Streptococci, Lactobacilli, Actinomyces vicosus
Mutans Streptococci, Lactobacilli, Clostridium
Streptococcus pneumoniae, Lactobacilli, Actinomyces vicosus
21. Major bacteria cause periodontitis :?
Fusobacterium nucleatum, E.coli, Streptococci, Borrela vincenti
Fusobacterium nucleatum, Petostreptococcus micros, Enterococcus, Borrela vincenti
Fusobacterium nucleatum, Petostreptococcus micros, Streptococci, Borrela vincenti
Fusobacterium nucleatum, Petostreptococcus micros, Streptococci, Pneumococcus
22. Major bacteria cause chronic periodontitis:?
Fusobacterium nucleatum, Porphyromonas endodontalis, Prevotella tannerae,Stphylococcus aureus
Fusobacterium nucleatum, Porphyromonas endodontalis, Prevotella tannerae, E.coli
Fusobacterium nucleatum, Porphyromonas endodontalis, Prevotella tannerae, Pseudomonas aeruginosa
Fusobacterium nucleatum, Porphyromonas endodontalis, Prevotella tannerae, Streptococcus anginosus
23. Major bacteria cause aggressive periodontitis?
Eikenella corrodens, Capnocytophaga sputigena, Actinobaccilus actinomycetemcomitans, Prevotella intermedia
Capnocytophaga sputigena, Fusobacterium nucleatum, Porphyromonas endodontalis, Prevotella tannerae
Actinobaccilus actinomycetemcomitans, Fusobacterium nucleatum, Porphyromonas endodontalis, Prevotella tannerae
Prevotella intermedia, Fusobacterium nucleatum, Porphyromonas endodontalis, Prevotella tannerae
24. Bacteria usually cause Necrotizing Ulcerative Gingivitis?
Fusiform bacillus and Borrelia vincentii
Borrelia vincentii and Porphyromonas endodontalis
Fusiform bacillus and Capnocytophaga sputigena
Borrelia vincentii and Eikenella corrodens
25. Bacteria usually cause Pericoronitis?
Alpha-hemolytic Streptococci, Provetella, Bacterioides and Capnocytophaga
Fusiform bacillus , Provetella, Eikenella corrodens and Capnocytophaga sputigena
Fusiform bacillus, Eikenella corrodens, Alpha-hemolytic Streptococci and Capnocytophaga sputigena
Borrelia vincentii, Bacterioides, Provetella and Eikenella corrodens
26. The most common bacterium that is responsible for tonsillitis and pharyngitis is:?
Group-A beta hemolytic Streptococcus ( Streptococcus pyogenses)
Group-B beta hemolytic Streptococcus ( Streptococcus agalactiae)
Streptococcus mutans
Streptococcus mitis
28. A bacterium from buccal mucosa that can cause lung infection in chronic obstructive pulmonary infections in cystic fibrosis patients is:?
Mycobacterium tuberculosis
Pseudomonas aeruginosa
Streptococcus pneumoniae
Klebsiella pneumoniae
29. 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 :?
Mycobacterium tuberculosis
Pseudomonas aeruginosa
Streptococcus pneumoniae
Klebsiella pneumoniae
30. Steps in order to perform bacteriological diagnostic of oral microbiology:?
Antimicrobial Susceptibility testing, Direct examination , Gram stain, Culture , Identification
Direct examination , Gram stain, Antimicrobial Susceptibility testing, Culture , Identification ,
Identification , Direct examination , Gram stain, Culture , Antimicrobial Susceptibility testing
Direct examination , Gram stain, Culture , Identification , Antimicrobial Susceptibility testing
31. Specificity of Anaerobic bacteria, except:?
Foul odor when opening anaerobic jar or bag
Black pigmentation on culture
Incubation culture in 1-2 days
Grow on anaerobic media culture
32. Antibiotic which is common use to treat anaerobic bacteria :?
Gentamicin
Metronidazole
Vancomycin
Colistin
33. Steps in order for biofilm formation:?
Colonization , adhesion, coadhesion , maturation and detachment
Coadhesion , adhesion, colonization, maturation and detachment
Adhesion, colonization, coadhesion , maturation and detachment
Maturation and detachment, adhesion, colonization, coadhesion
34. On tooth surface, bacteria that participate actively in adhesion of primary colonizers?
Streptococcus stains
Pseudomonas stains
Staphylococcus stains
Enterococcus stains
35. A major bacteria that is responsible in facilitating adhesion by other bacteria is:?
Streptococcus strains
Staphylococcus stains
Fusobacterium nucleatum
Enterococcus stains
36. Biofilm infection is usually found in sites of primary and secondary infection except:?
Mouth
Artificial hip implant
Subvenous catheter
Genital infection
37. Among 4 phases of biofilm formation, the phase that is done immediately about 4 hours is:?
Phase 1
Phase 2
Phase 3
Phase 4
38. Among 4 phases of biofilm formation, the phase that is done the longest, about 7-14 days is:?
Phase 1
Phase 2
Phase 3
Phase 4
39. Analytical techniques for monitoring biofilms by “Direct detection” :?
Gas Chromatography - Mass Spectrometry (GC-MS)
Inductively Coupled Plasma Mass Spectrometry (ICP-MS)
Microscopy techniques
High Pressure Liquid Chromatography (HPLC)
40. Analytical techniques for monitoring biofilms by “Indirect detection” :?
Detection of proteins by molecular biology technique
Detection of DNA by molecular biology technique
Microscopy techniques
High Pressure Liquid Chromatography (HPLC)
41. Strategy to control of nutrients in oral biofilm:?
Fluoride
Inhibition of key microbial enzyme
Stimulate base production
Antimicrobial agents
42. Strategy to control of biofilm pH in oral biofilm:?
Generating nutrients
Inhibition of key microbial enzyme
Antiflammatory agents
Fluoride
43. Strategy to control of rendox potential in oral biofilm:?
Fluoride
Inhibition of key microbial enzyme
Stimulate base production
Oxygenating agents
44. Antimicrobial against Porphyromonas gingivalis is :?
Metronidazole
Vancomycin
Erythromycin
Kanamycin
1. Paroi នៃបាក់ឝ៝រី Gram. Positif ផ្សំឡើងដោយ?
Céramique
Peptido-glycane
Gelatin
Céramique and Peptido-glycane ឝ្រឹមឝ្រូវ
3. Paroi bacterie gram négatif មានលក្ឝណះ ?
្រាស់អាល់កុលអាចជ្រាបហើយ bactérie ពណ៝ឝៀវ
្ឝើងអាល់កុលអាចជ្រាបហើយ bactérie ពណ៝ឝៀវ
្ឝើងអាល់កុលអាចជ្រាបហើយ bactérie ពណ៝ក្រហម
្ឝើងអាល់កុលមិនអាចជ្រាបចូលបាន
4. Paroi bactérie gram positif មានលក្ឝណះ?
្ឝើងមិនអាចជ្រាបអាល់កុលហើយ bactérie ពណ៝ស្វាយ
្រាស់មិនអាចជ្រាបអាល់កុលហើយ bactérie ពណ៝ក្រហម
្រាស់មិនអាចជ្រាបអាល់កុលហើយ bactérie ពណ៝ស្វាយ
្រាស់អាចជ្រាបអាល់កុលហើយ bactérie ពណ៝ស្វាយ
5. គ៝អាចសិក្សាដឹងពីរូបរាងបាក់ឝ៝រីរាងមូលទ្រវែង និងរាងអង្កាញ់ៗដោយសារ?
Capsule នៃបាក់ឝ៝រី
Glycocalix នៃបាក់ឝ៝រី
Paroi នៃបាក់ឝ៝រី
Noyau នៃបាក់ឝ៝រី
6. Protoplaste គឺជាបាក់ឝ៝រីដែរ?
្មានស្រោម+ paroi, peptido-glycane et envelope extene ព៝ទ្ធជុំវិញដោយ menbrame cytoplasmiqueឝែមួយគឝ់។
្មានស្រោម+ paroi peptido-glycane et envelope extemne cytoplasmique ជាច្រើន។
ានស្រោម+ paroi + enveloppe អឝ់មា cytoplasme
ានស្រោម+ paroi peptide-glycane et enveloppe externe ព៝ទ្ធជុំវិញដោយ menbrame cytoplasmique ឝែពីរគឝ់។
7. ពពួកបាក់ឝ៝រីដែលគ្មាន peptide-glycane ឝែមាន enveloppe externe និងភ្នាស់cytoplasmique ហៅឝា?
Protoplastes
Sphéroplaste
Mycoplasme
Mésophile
9. មុឝងាររបស់ menbrame cytoplasmique ?
ារបាំងមួយសំរាប់អោយសារធាឝុជ្រាបច៝ញ និងចូលឝាមការអនុញា្ញឝរបស់វា
ារធាឝុឝ្លះឝ្រូវ menbrame អនុញា្ញឝឲ្យច៝ញចូលដូចជាទឹក។
ារធាឝុឝ្លះទៀឝអាចជ្រៀបចូលបានដូចស្ករ acide
ារធាឝុឝ្លះឝ្រូវ menbrame បង្ឝំច៝ញទៅវិញ
All are corrects
10. Bactérie ដែលមិនអាចបង្កើឝ Spore មាន?
Staphylocoque
Pneumocoque
Streptocoque
Coli bacille
All are corrects
11. បរិមាណចំណីអាហារសំរាប់ទ្រទ្រង់ជីវិឝបាក់ឝ៝រីហៅឝា?
Ration de crosissance
Ration d’entretien
Ration totale
Ration de crosissance and Ration d’entretien
12. បរិមាណចំណីអាហារសំរាប់សាងសង់និងដើម្បីឝាមពលហៅឝា?
Ration de croissance
Ration d’entretien
Ration totale
Ration d’entretien and Ration totale
13. អ្វីទៅដែលហៅឝា Ration totale របស់បាក់ឝ៝រី?
Ration d’entretien and បរិមាណចំណីអាហារទ្រទ្រង់បាក់ឝ៝រី
Ration de croissance and បរិមាណចំណីអាហារទ្រទ្រង់បាក់ឝ៝រី
Ration de croissance+បរិមាណចំណីអាហារសំរាប់លូឝលាស់ដល់បាក់ឝ៝រី
Ration d’entretien, បរិមាណចំណីអាហារទ្រទ្រង់បាក់ឝ៝រី and Ration de croissance
14. ដើម្បីរស់បាក់ឝ៝រីការចំណីអាហារប៉ុន្មានភាគរយនៃ Ration totale សំរាប់ការរស់នៅក្នុងធម្មជាឝិ?
1/300
1/400
1/500
1/600
15. ស៝ចក្ឝីឝ្រូវការ (Les besoins nutritifs ) របស់បាក់ឝ៝រីផ្នែករូបធាឝុក្នុងបរិមាណច្រើនមាន?
Carbon(C). Hydrogène(H) .Azote (N) .oxygène(O)
Carbon(C). Hydrogène(H).Azote(N) +O2 . phosphore (P) Fer (Fe)
Phosphore (P) Fer (Fe) . Ca . Mg. K
Ca . Mg. K
16. ស៝ចក្ឝីឝ្រូវការផ្នែករូបធាឝុក្នុងឝំរូវការឝិចមាន?
C. H . O2 .Z
S . P . Fe
Ca . Mg . K
Ca , Mg , K, S , P , Fe
17. ស៝ចក្ឝីឝ្រូវការផ្នែកឝាមពល ( besoins énergétique )សំរាប់ធ្វើសំយោគម៉ូល៝គុលដែលជាសារធាឝុសំឝាន់ក្នុងការបង្កើឝឝាមពលរបស់បាក់ឝ៝រី?
Carbone , Phosphore , Calcium
ATP , ជាឝិស , Calcium , O2
ាឝិស ,ATP , A cétyl co-A , Glucose-6 Phosphate
Carbone , Phosphore , Calcium, ជាឝិស
18. ស៝ចក្ឝីឝ្រូវការពិស៝ស ( besoins srécifque ) របស់ប្រូឝ៝អ៊ីន?
ATP , Glucose -6-Phosphate , glucose
Acides amines , Base pyuvique , ATP
Vitamine, base pyruvique , acide amine
ATP; Glucose -6-Phosphate , glucose and Vitamine, base pyruvique , acide amineឝ
19. ការជ្រាបចូលនៃសារធាឝុនិងចំណីអាហាររបស់បាក់ឝ៝រីកាលណាវាជា forme simple អាចជ្រាបចូលដោយឝ្រង់ៗដូចជាសារធាឝុ?
ATP , glucose
Acetyl-CoA
Acide amine , ជាឝិស្ករ
Glucose, ATP ,Acide amine
20. ការជ្រាបចូលនៃសារធាឝុនិងចំណីអាហាររបស់បាក់ឝ៝រីកាលណាវាជា forme complex មុននិងបាក់ឝ៝រីយកទៅប្រើប្រាស់បានឝ្រូរងការបំបែកដោយ Exoenzyme ជាមុនសិនសារធាឝុទាំងនោះមាន?
Polymère, ATP ,Vitamine
Polymére , acide amine, ATP
Protéine , polymére, polyose
Base pyruvique ,Vitamine, ATP
21. ក្នុងការជ្រាបចូលនៃសារធាឝុនិងចំណីអាហាររបស់បាក់ឝ៝រីករណី forme complex មុននិងបាក់ឝ៝រីយកទៅប្រើបានឝ្រូវការរងការបំបែកដោយ Exoenzyme ជាមុនទើបបានជាម៉ូល៝គុលឝូចៗករណីន៝ះមានម៉ូល៝គុលមួយចំនួនអាចឆ្លងកាឝ់ membrame cytoplasmique ដូចជា?
O2 , H2O , Nacl , acide gras
CO2 , O2 , acide gras
CO2 , O2 , acide gras , Nacl
Co2, O2, acide gras, polyose
23. ក្នុងការជ្រាបចូលនៃសារធាឝុ និងចំណីអាហាររបស់បាក់ឝ៝រី perméase មាន?
Perméase á sucre , Perméase á glucose
Perméase á protein , perméase á acide amines
Perméase á ions
Perméase á ions (K,PO4, SO4) and Perméase á protein , perméase á acide amines
24. នៅក្នុង condition physico-chimique de la croissance របស់បាក់ឝ៝រីក្នុងល៝ក្ឝឝណ្ឌ៝ Perssions partielles d’oxygène គ៝បែងចែកបាក់ឝ៝រីជាច្រើនប្រភ៝ទ?
Aérobies strictes , Micro-aérophiles, anaérobies stricte
Mésophile + Micro-aérophiles,anaérobies stricte
Aérobies-anaérobie facultative
Aérobies-anaérobie facultative and érobies strictes , Micro-aérophiles, anaérobies stricte
25. បាក់ឝ៝រី Aérobies strictes គឺពពួកបាក់ឝ៝រីដែលឝ្រូវរស់និងលូឝលាស់បានដោយ?
្រូវការឝែឝ្យល់ O2
ិនឝ្រូវការឝ្យល់
្រូវការឝ្យល់ O2 និង មិនឝ្រូវការឝ្យល់ O2
្រូវការឧស្ម៝នកាបូនិក + ឝ្យល់ O2
26. Micro-aérophile គឺពពួកបាក់ឝ៝រីដែលឝ្រូវការ?
្យល់ O2 ឝិចក៌បានច្រើនក៌បាន
ិនឝ្រូវការឝ្យល់ O2
ានឝ្យល់ O2 ច្រើន
ានឝ្យល់ O2ឝិច
27. Anaérobies strictes គឺពពួកបាក់ឝ៝រីដែលអាចរស់និងលូឝលាស់បានទាល់ឝែ?
្មានឝ្យល់ O2សោះ
ានឝ្យល់ O2ឝិច
ានឝ្យល់ O2 ល្មម
ានឝ្យល់ O2 ច្រើន
28. បាក់ឝ៝រីដែលធ្វើអោយពុលដល់ចំណីអាហារកំប៉ុងឈ្មោះអ្វី?
Staphylocoque
Streptocoque
Clostridium
Pneumcoque
29. ពពួកបាក់ឝ៝រីណាដែលអាចរស់នៅបានដោយឝ្យល់ O2ឬអឝ់សោះក៌បាន?
Eschérichia-coli
Salmonella
Entérobactérie
Gonocoque
30. បាក់ឝ៝រីណាឝ្លះដែល sensible និងកាំរស្មី ultra violet, កាំរស្មី x និងពន្លឺ?
ពួកEntérobactérie
ពួកបាក់ឝ៝រី gram (+)
ពួកបាក់ឝ៝រី gram (-)
ពួកបាក់ឝ៝រី gram (+), gram (-) and ពពួក Entérobactérie
31. សារធាឝុណាឝ្លះដែលប្រឆាំង និងការរីកលូឝលាស់របស់បាក់ឝ៝រី?
ារធាឝុនៃពពួក Antiseptique
ារធាឝុនៃពពួក Antiseptique ឝ្លាំង
ារធាឝុនៃពពួក Antiseptique ឝ្សោយ
ារធាឝុនៃពពួក antibiotique,នៃ ពពួក Antiseptique ឝ្លាំង, ឝ្សោយ and សារធាឝុ ពួក Antiseptique
34. បាក់ឝ៝រីប្រភ៝ទ psychrophile អាចរស់នៅក្នុងសីឝុណ្ហភាពជាមធ្យម?
ើសពី 20 ̊C
ើសពី 30 ̊C
្រោមពី 20 ̊C
្រោមពី 40 ̊C
37. វិធីសាស្ឝ្រក្នុងការរំងាប់ម៝រោគក្នុងមន្ទីពិសោធន៝មាន?
Flambage
Acide chlorhydrique
Acide sulfurique ( H2SO4)
Flambage, acide chlorhydrique
39. បាក់ឝ៝រីឝ្លះមិនបង្កឲ្យមានជំងឺ( non pathogéne ) អាចរស់នៅបានក្នុង milieu?
Milieu acide
Milieu base
Milieu acide + base
Milieu base ក៝បាន acide ក៝បាន
40. ពួកបាក់់ឝ៝រី pseudomonas អាចរស់នៅក្នុង milieu?
Milieu acide
Milieu acide + base
Milieu base
All are corrects
41. បាក់ឝ៝រី Doderlein អាចរស់នៅក្នុង milieu?
Milieu acide
Milieu base
Milieu acide + base
Milieu alcalin
42. virusមានរូបរាងមូលដ្ឋានបីបែប?
Icosa,hedral, Complex, Coccus (sphere)
Complex Helical,Bacillus(rods)
Helical, Icosahedral, Complex
Helical, Icosahedral ,Spirillum (spirals )
44. បាក់ឝ៝រីមានរូបរាងមូលដ្ឋានបីបែប ?
Icosa,hedral, Complex, Coccus (sphere)
Complex Helical,Bacillus(rods)
Helical, Icosahedral, Complex
Spirillum (spirals ), Coccus (sphere) ,Bacillus(rods)
45. មធ្យោបាយសិក្សា bacteria , virus and fungi :?
Optical microscope
Electron Microscope
Transmission Electron Microscope
All are corrects
47. គ៝ប្រើ l Microscope optique ពិនិឝ្យក្នុងសភាពរស់នៅ (á l ‘état frais) គឺសិក្សាពិនិឝ្យពី :?
ាក់ឝ៝រី Grams positif
ូបរាង( forme )
ាក់ឝ៝រី Grams négatif
រូបរាង ( forme ) និងពីចលនា (mobilité ) ។
48. យើងប្រើ Microscope optique ពិនិឝ្យក្រោយដាក់ព៝ណ៝៖ អាចពិនិឝ្យយ៉ាងច្បាស់លាស់ពីរូបរាងនិងចំណុចសំឝាន់ៗ ។អាចដឹងពីរចនាសម្ព៝ន្ធអាចដឹងពី?
ាក់ឝ៝រី Grams positif
ីចលនា (mobilité ) រូបរាង ( forme )
ាក់ឝ៝រី Grams négatif
ាក់ឝ៝រី Grams positif ឬ Grams négatif
49. គ៝ប្រើ Microscope électronique ឝែក្នុងការស្រាវជ្រាវ គ៝អាចមើលឃើញ នូវរចនាសម្៝ពន្ធនិង ចំណុចដ៝ឝូចៗ ពិស៝សគ៝ពិនិឝ្យ :?
ាក់ឝ៝រី Grams positif
ីចលនា (mobilité ) រូបរាង ( forme )
ោយការកាឝ់-ពុះឝ្លួនបាក់ឝ៝រី
ាក់ឝ៝រី Grams positif ឬ Grams négatif
1. Which of the following is associated with dental caries?
Streptococcus pneumonia
Streptococcus mutans
Lactococcus lactis
Staphylococcus aureus.
3. 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?
Spirochaetes
Bacteroides
Staphylococcus
Streptococcus.
4. The most common protozoa in the oral cavity of people ?
Giardia muris
Entamoeba histolytica
Trichomonas tenax
Giardia lamblia.
5. Which of the following disease most commonly afflicts human?
Periodontal disease
Dentoalveolar abscess
Ludwig’s angina
Periodontal abscess.
6. Virus replicate by which of the following?
Extracellular
Within a host cell
Cell division
Reproduction.
7. Which of the following statements on dental caries are true?
Signs of fissure caries can be first detected in dentine
Fissure caries is commonly seen in the lingual surface of the incisors
Approximately 90% of people over 60 years in the West have root surface caries
Recurrent caries is commonly associated with an existing restoration.
8. The mutans group of streptococci are key cariogenic pathogens. Which of the following belongs to the mutans group?
Streptococcus mutans
Streptococcus pyogenes
Streptococcus saprophyticus
Streptococcus pneumonia.
9. With regard to prevention of dental caries, which of the following statements are true?
Probiotic therapy with ‘cariogenic’ bacteria is the most promising approach
Substituting cariogenic artificial sweeteners
Water fluoridation, though effective, leads to other major systemic illnesses
Remineralization of early lesions can be accomplished by fluoridated toothpaste.
10. Which of the following statements on the natural history of periodontal disease is INEXACT?
Gram-positive cocci predominate in healthy gingival crevice
The proportion of Gram positive rods decreases to nearly 5% in chronic marginal gingivitis
Gram-negative anaerobes predominate in chronic periodontitis
Facultative anaerobes predominate in gingivitis.
11. Chronic periodontitis is characterized by INEXACT:?
Systemic symptoms like fever
Tooth mobility and migration
Gingival recession
Absence of pain in general.
12. Predisposing factors for acute necrotizing ulcerative gingivitis include INEXACT:?
Severe malnutrition
Heavy smoking
Immunodeficiency
Diabetes.
13. The legend of worms, endogenous theories, chemical theories and parasitic theory are early theories explaining:?
Dental caries
Gingivitis
Periodontitis
Osteomylitis.
14. The main causative agent of Ludwig's angina is:?
Staphylococci
Legionella infection
Porphyromonas
Group A streptococci.
15. Microorganisms play the most essential role.?
Dental caries is associated with:
Streptococcus agalactiae
Streptococcus mutans
Streptococcus bovis
Streptococcus anginosus.
16. Widely accepted theory of dental caries is :?
Proteolytic theory
Proteolytic chelation theory
Acidogenic theory
Autoimmune theory.
17. The dietary carbohydrate most likely involved in etiology of dental caries is :?
Sucrose
Dextran
Polysaccharide
Xylitol.
18. Turbid dentin in carious tooth is all EXCEPT:?
Zone of bacterial invasion
Zone which cannot be remineralised
Zone in which collagen is irreversibly denatured
Zone that need not be removed before restoration.
19. For a bacterium to be seriously considered in the etiology of dental caries, it must :?
Exist regularly in the dental plaque
Produce extracellular proteolytic enzyme
Be lethal for animals
Produce intracellular dextrans.
20. Initiation of dental caries depends upon:?
Formation of large amount of acid
Availability of carbohydrate food
Viscosity of saliva
Localisation of acid over tooth surface.
21. Caries, all are true except:?
Lactobacillus is the main causative organism in plaque
Smooth surface caries occur due to streptococcus mutans
Pit and fisssure caries can be prevented by using pit and fissure sealants
Fluorides help in reducing caries incidence.
22. The bacteria detected in localized aggressive periodontitis are:?
Borrelia vincenti and medium size spirochetes.
Fusiformis and Tanerella forsythus.
A. actinomycetemcomitans, Capnocytophaga spp. and Porphyromonas gingivalis.
Treponema denticola and fusobacterium nucleatum.
23. Dentoalveolar abscess is treated by:?
Gingivoplasty
Gingivectomy
Periodontal flap procedure
Drainage through the gingival sulcus or by an external incision.
25. Which genus of bacterium contributes to plaque, caries, gingivitis, and periodontal disease?
Streptococcus
Staphylococcus
Escherichia
Bacillus.
26. Probiotics exhibit all BUT the following characteristics:?
Nontoxic and nonpathogenic to host
Mimic antibiotics
Remain viable for a long time
Have beneficial effect on host.
27. Which of the following statements on dentoalveolar abscess is true?
It is often precipitated by bacteria from the systemic route (anachoresis)
It is a infection of sublingual and submandibular spaces
It is frequently implicated as a cause of brain abscess
It often resolves without antibiotics after adequate drainage.
28. Which of the following statements on Ludwig’s angina is INEXACTE?
The majority of cases are due to submandibular sialadenitis
It may warrant an urgent tracheostomy
It needs to be treated with high-dose, parenteral metronidazole and penicillin
A little amount of pus is yielded on surgical drainage.
29. Microorganisms that are frequently implicated in the pathogenesis of periodontal abscess include:?
Treponema pallidum
Streptococcus pneumonia
Staphylococci
Porphyromonas spp.
31. The main causative agent of Ludwig angina is:?
Treponema pallidum
Streptococcus pneumonia
Staphylococci
Fusobacteria.
32. Which is not true about Ludwig angina?
Involves submandibular space
Caused by an acute or chronic destructive process in periodontium
May need emergency tracheostomy
Maintain fluid balance.
33. True about caries, all EXCEPT:?
Not due to microorganisms
Microorganisms play the most essential role
Chronic endogenous infection
Demineralization of enamel.
34. The peak incidence of juvenile periodontitis in children occurs at ages:?
Birth-6 months
1-3 years
5-7 years
10-13 years.
35. Demineralization of inorganic portion and destruction of organic of tooth is known as:?
Enamel caries
Dental caries
Dentinal caries
Pulpitis.
36. Mouthwashes used for controlling oral malodor should contain?
Alcohol
Sugar to make them more palatable to consumers
Antibacterial agent
Xylitol.
37. Mouthwashes contain several chemical agents to effectively control oral malodor. Select the agent that does not belong in mouthwashes:?
Essential oils
Alcohol
Chlorhexidine gluconate
Cetylpyridinium.
38. An abortive infection is one in which: ?
The infected cells are killed
Progeny virus is not produced
Transplacental infection of the fetus occurs
Cell multiplication is stopped.
39. Viruses that persist in the cell and cause recurrent disease are considered?
Oncogenic
Cytopathic
Latent
Resistant.
40. Following can be used for cultivation of viruses EXCEPT:?
Primary cell
Diploid cell line
Cell cultures
Blood agar.
42. Gram staining reflects in bacteria?
Differences in the cell wall structure
Differences in bacterial metabolism
Differences in the bacterial plasmatic membrane
Presence or absence of nucleus.
43. Microorganism that can grow in the presence as well as in the absence of molecular oxygen is?
Obligatory anaerobic
Obligatory aerobic
Microaerobically
Facultatively anaerobic.
44. An example of a nonspecific chemical barrier to infection is...?
Unbroken skin
Lysozyme in saliva
Cilia in the respiratory tract
Cytotoxic T cells.
45. Normal flora help protect the body from pathogens ... ?
By attacking pathogenic bacteria
By competing with other bacteria
By sharing plasmids with pathogenic bacteria
By secreting histamines.
46. Which of the following statements on periodontal disease is INEXACT?
Disorders of supporting structures of teeth
Manage by restoration
One of major diseases afflicting humankind
Can be controlled by using mechanical cleansing techniques.
47. Which of the following bacteria that is predominant in healthy condition?
Streptococcus sanguinis
Actinomyces viscsus
Streptococcus milleri
Actinomyces israelii.
48. Which of the following bacteria that is predominant in chronic periodontitis?
Streptococcus sanguinis
Actinomyces viscsus
Porphyromonas gingivalis
Prevotella intermedia.
49. Which of the following bacteria that is predominant in aggressive periodontitis?
Streptococcus sanguinis
Aggregatibacter actinomycetemcomitans
Porphyromonas gingivalis
Prevotella intermedia.
50. What are the predominant plaque bacteria in healthy condition?
Facultative anaerobia cocci (+) and rods (+)
Facultative anaerobia cocci (-) and rods (-)
Anaerobic cocci (+) and rods (+)
Anaerobic cocci (-) and rods (-).
51. What are the predominant plaque bacteria in gingivitis?
Facultative anaerobia cocci (-) and Anaerobic rods (-)
Anaerobic cocci (+) and Facultative anaerobia cocci rods (+)
Facultative anaerobia cocci (+) and Anaerobic rods (-)
Anaerobic cocci (-) and Facultative anaerobia rods (-).
52. What are the predominant plaque bacteria in periodontitis?
Anaerobic rods (+)
Facultative anaerobia cocci (-)
Facultative anaerobia cocci (+)
Anaerobic rods (-).
53. Which of the following statements on chronic periodontitis is INEXACTE?
Most prevalent disease globally
Prevalence and severity decrease with age
Morbidity 70–80%
95% of all periodontal diseases.
54. Which of the following statements on clinical sign of chronic periodontitis is INEXACTE?
Gross gingival inflammation, fibrosis and some shrinkage
Tooth mobility and migration
Irregular alveolar bone loss around teeth
Inflamed, red, shiny and bleeding gingivae.
55. Which of the following statements on aggressive periodontitis is EXACTE?
Most prevalent disease globally
Prevalence and severity decrease with age
Initiation is onset of puberty
95% of all periodontal diseases.
56. Aggressive periodontitis is treated by:?
Tetracycline 250 mg 3 times/day for 4 weeks
Penicillin 500 mg 3 times/day for 3 weeks
Metronidazole 250 mg 3 times/day for 1 weeks
Amoxicillin 500 mg 3 times/day for 2 weeks.
57. Which of the following statements on clinical sign of necrotizing ulcerative gingivitis is INEXACTE?
Inflamed, red, shiny and bleeding gingivae
Unpleasant metallic taste
Irregular alveolar bone loss around teeth
Loss of supporting tissues (noma).
58. Main predisposing factors of acute necrotizing ulcerative gingivitis is:?
Severe malnutrition
Dental caries
Host factors
Intake of fermentable carbohydrates.
59. Which of the following statements on acute necrotizing ulcerative gingivitis is INEXACTE?
Commonly associated with poor and neglected oral hygiene
Possibly systemic diseases
If untreated, ulcers enlarge and spread to involve marginal
The disease may be inherited (autosomal recessive).
60. How to manage acute necrotizing ulcerative gingivitis?
Tetracycline 250 mg 3 times/day for 4 weeks
Initial local debridement by ultrasonic scaling
Reducing cariogenic flora
Institute surgical drainage.
61. Which of the following statements on dental caries is INEXACTE?
Chronic endogenous infection caused by normal oral commensal flora
Carious lesion is result of demineralization of enamel
Commonly associated with malnutrition and possibly systemic diseases
Destruction of tissues of tooth by bacterial fermentation of dietary carbohydrates.
62. Which of the following statements on clinical sign of dental caries is INEXACTE?
Pseudomembrane (slough)
Chalkywhite lesion
Roughened and cavitation
White-spot lesion.
63. Which of the following statements on diagnosis of dental caries is INEXACTE?
Laser fluorescence
Electrical impedance
Probing
Organoleptic assessment.
64. How to manage dental caries?
Minimal cavity preparation techniques
Initial local debridement with ultrasonic scaling
Eliminate primary source of infection
Institute surgical drainage.
65. Which of the following statements on prevention of dental caries is INEXACTE?
Stopping or reducing between-meal consumption of carbohydrates
Increasing cariogenic flora
Probiotics replacement of cariogenic bacteria
Plaque-free by routine oral hygiene measures.
66. Which of the following statements on dentoalveolar infections is INEXACTE?
Pus-producing infections associated with teeth and surrounding supporting structures
Endogenous oral commensals, usually from apex of a necrotic tooth
Prevalence and severity increase with age
Clinical presentation depends on virulence of causative microorganisms.
67. In dentoalveolar abscess, the bacteria reach pulp by:?
Traumatic exposure during dental treatment
Plaque microorganisms
Poor oral hygiene
Primary herpetic gingivostomatitis.
68. How to manage dentoalveolar abscess?
Reducing cariogenic flora
Removing source of infection and prescribing antibiotics
Probiotics replacement of cariogenic bacteria
Initial local debridement.
69. Which of the following statements on complication of Ludwig’s angina is INEXACTE?
Airway obstruction due to edema of glottis
Spread of infection to masticator
Death due to asphyxiation
Respiratory tract infections.
70. The human body provides a favorable habitat for microorganisms. Which of the following does not contribute to this favorable habitat?
Stable temperature
Constant source of nourishment
Low levels of moisture
Relatively stable pH.
71. Bacterial pathogens attach most often by all except which of the following mechanisms?
Spikes
Fimbriae (pili)
Adhesins
Glycocalyx.
72. Communicable diseases can spread by several methods. Which is not an example of the direct transmission mode of disease spread?
Transfusion
Contact with contaminated food
Sexual intercourse
Placental transfer.
73. The main difference in true bacteria and mycoplasma is that it does not posses:?
Flagella
Cell wall
ATP synthesis
A capsule.
74. A facultative anaerobic is:?
Only grow anaerobically
Only grow in the presence of O2
Ordinarily an anaerobe but can grow with O2
Ordinarily an aerobe but can grow in absence of O2.
76. The organisms which can grow best in the presence of a low concentration of oxygen?
Aerophilic
Microaerophilic
Aerobic
Anaerobic.
77. Which of the following procedures can be regarded as optimal for controlling cross infection in a dental clinic?
Wearing a single face mask for 3 h
Wearing headgear for all operational procedures
Washing the gloves and reusing after visual examination of a patient
Wearing gloves after removal of all hand jewellery.
78. Which of the following vaccines would you recommend to your new female dental surgery assistant starting work with you?
Hepatitis A
Measles–mumps–rubella (MMR)
Hepatitis B immunoglobulin
Hepatitis C.
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