Oral Microbiology Test

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1 / 60

Lysozyme is present in?

a. Sweat

b. Urine

c. Saliva.

d. Cerebro spinal fluid (CSF)

2 / 60

The legend of worms, endogenous theories, chemical theories and parasitic theory are early theories explaining:?

a. Gingivitis

b. Osteomylitis.

c. Dental caries

d. Periodontitis

3 / 60

Caries, all are true except:?

a. Fluorides help in reducing caries incidence.

b. Lactobacillus is the main causative organism in plaque

c. Pit and fisssure caries can be prevented by using pit and fissure sealants

d. Smooth surface caries occur due to streptococcus mutans

4 / 60

Gram staining reflects in bacteria?

a. differences in the cell wall structure

b. differences in the bacterial plasmatic membrane

c. presence or absence of nucleus.

d. differences in bacterial metabolism

5 / 60

Mouthwashes contain several chemical agents to effectively control oral malodor. Select the agent that does not belong in mouthwashes:?

a. Chlorhexidine gluconate

b. alcohol

c. Cetylpyridinium.

d. essential oils

6 / 60

Turbid dentin in carious tooth is all EXCEPT:?

a. Zone that need not be removed before restoration.

b. Zone which cannot be remineralised

c. Zone in which collagen is irreversibly denatured

d. Zone of bacterial invasion

7 / 60

Chronic periodontitis is characterized by INEXACT:?

a. absence of pain in general.

b. systemic symptoms like fever

c. tooth mobility and migration

d. gingival recession

8 / 60

With regard to prevention of dental caries, which of the following statements are true?

a. substituting cariogenic artificial sweeteners

b. probiotic therapy with ‘cariogenic’ bacteria is the most promising approach

c. water fluoridation, though effective, leads to other major systemic illnesses

d. remineralization of early lesions can be accomplished by fluoridated toothpaste.

9 / 60

Which of the following statements on prevention of dental caries is INEXACTE?

a. Stopping or reducing between-meal consumption of carbohydrates

b. Plaque-free by routine oral hygiene measures.

c. Increasing cariogenic flora

d. Probiotics replacement of cariogenic bacteria

10 / 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

11 / 60

Predisposing factors for acute necrotizing ulcerative gingivitis include INEXACT:?

a. immunodeficiency

b. diabetes.

c. severe malnutrition

d. heavy smoking

12 / 60

Following can be used for cultivation of viruses EXCEPT:?

a. Diploid cell line

b. Primary cell

c. Cell cultures

d. Blood agar.

13 / 60

Which of the following statements on clinical sign of necrotizing ulcerative gingivitis is INEXACTE?

a. Irregular alveolar bone loss around teeth

b. Unpleasant metallic taste

c. Loss of supporting tissues (noma).

d. Inflamed, red, shiny and bleeding gingivae

14 / 60

Which of the following statements on clinical sign of chronic periodontitis is INEXACTE?

a. Inflamed, red, shiny and bleeding gingivae.

b. Irregular alveolar bone loss around teeth

c. Gross gingival inflammation, fibrosis and some shrinkage

d. Tooth mobility and migration

15 / 60

Which of the following statements on dental caries are true?

a. approximately 90% of people over 60 years in the West have root surface caries

b. signs of fissure caries can be first detected in dentine

c. recurrent caries is commonly associated with an existing restoration.

d. fissure caries is commonly seen in the lingual surface of the incisors

16 / 60

The main difference in true bacteria and mycoplasma is that it does not posses:?

a. A capsule.

b. ATP synthesis

c. Cell wall

d. Flagella

17 / 60

The main causative agent of Ludwig angina is:?

a. Staphylococci

b. Treponema pallidum

c. Streptococcus pneumonia

d. Fusobacteria.

18 / 60

The peak incidence of juvenile periodontitis in children occurs at ages:?

a. Birth-6 months

b. 10-13 years.

c. 5-7 years

d. 1-3 years

19 / 60

Bacterial pathogens attach most often by all except which of the following mechanisms?

a. Spikes

b. Glycocalyx.

c. Fimbriae (pili)

d. Adhesins

20 / 60

Which of the following procedures can be regarded as optimal for controlling cross infection in a dental clinic?

a. Wearing headgear for all operational procedures

b. Washing the gloves and reusing after visual examination of a patient

c. Wearing a single face mask for 3 h

d. Wearing gloves after removal of all hand jewellery.

21 / 60

The primary cause of periodontal diseases is?

a. Restoration.

b. Calculus

c. Malocclusion

d. Dental Plaque

22 / 60

Which of the following statements on the natural history of periodontal disease is INEXACT?

a. facultative anaerobes predominate in gingivitis.

b. Gram-positive cocci predominate in healthy gingival crevice

c. the proportion of Gram positive rods decreases to nearly 5% in chronic marginal gingivitis

d. Gram-negative anaerobes predominate in chronic periodontitis

23 / 60

Virus replicate by which of the following?

a. Within a host cell

b. Extracellular

c. Cell division

d. Reproduction.

24 / 60

Microorganisms that are frequently implicated in the pathogenesis of periodontal abscess include:?

a. Porphyromonas spp.

b. Streptococcus pneumonia

c. Staphylococci

d. Treponema pallidum

25 / 60

Principal Cocci Gram negative bacteria found in oral cavity:?

a. Gemella

b. Enterococcus

c. Streptococcus

d. Veillonella

26 / 60

A bacterium that never found in tooth surface:?

a. Streptococcus mutans

b. Streptococcus anginosus

c. Streptococcus pneumoniae

d. Streptococcus mitis

27 / 60

Major bacteria cause periodontitis 😕

a. Fusobacterium nucleatum, Petostreptococcus micros, Streptococci, Borrela vincenti

b. Fusobacterium nucleatum, E.coli, Streptococci, Borrela vincenti

c. Fusobacterium nucleatum, Petostreptococcus micros, Enterococcus, Borrela vincenti

d. Fusobacterium nucleatum, Petostreptococcus micros, Streptococci, Pneumococcus

28 / 60

Steps in order for biofilm formation:?

a. Maturation and detachment, adhesion, colonization, coadhesion

b. Adhesion, colonization, coadhesion , maturation and detachment

c. Colonization , adhesion, coadhesion , maturation and detachment

d. Coadhesion , adhesion, colonization, maturation and detachment

29 / 60

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. B. Actinomyces

d. C. Prevotella

30 / 60

Antibiotic which is common use to treat anaerobic bacteria 😕

a. Colistin

b. Gentamicin

c. Metronidazole

d. Vancomycin

31 / 60

A bacterium that is usually found in tongue 😕

a. Staphylococcus epidemidis

b. Streptococcus mitis

c. Streptococcus pneumoniae

d. Clostridium difficile

32 / 60

Among 4 phases of biofilm formation, the phase that is done the longest, about 7-14 days is:?

a. Phase 1

b. Phase 3

c. Phase 4

d. Phase 2

33 / 60

មធ្យោបាយសិក្សា bacteria , virus and fungi 😕

a. Transmission Electron Microscope

b. Electron Microscope

c. Optical microscope

d. All are corrects

34 / 60

Paroi bactérie gram positif មានលក្ខណៈ?

a. ក្រាស់ មិនអាចជ្រាបអាល់កុល ហើយ bactérie ពណ៍ស្វាយ

b. ក្រាស់ មិនអាចជ្រាបអាល់កុល ហើយ bactérie ពណ៍ក្រហម

c. ស្តើង មិនជ្រាបអាល់កុល ហើយ bactérie ពណ៍ស្វាយ

d. ក្រាស់ អាចជ្រាបអាល់កុល bactérie ពណ៍ស្វាយ

35 / 60

Bactérie ដែលមិនអាចបង្កើត Spore មាន?

a. streptocoque

b. Staphylocoque

c. coli bacille

d. All are corrects

e. pneumocoque

36 / 60

នៅក្នុង condition physico-chimique de la croissance របស់បាក់តេរីក្នុងល័ក្ខខណ្ឌ័ Perssions partielles d’oxygène គេបែងចែកបាក់តេរីជាច្រើនប្រភេទ?

a. Mésophile + Micro-aérophiles,anaérobies stricte

b. Aérobies-anaérobie facultative

c. Aérobies strictes , Micro-aérophiles, anaérobies stricte

d. Aérobies-anaérobie facultative and érobies strictes , Micro-aérophiles, anaérobies stricte

37 / 60

បាក់តេរី Aérobies strictes គឺពពួកបាក់តេរីដែលត្រូវរស់ និង លូតលាស់បានដោយ?

a. ត្រូវការតែខ្យល់ O2

b. មិនត្រូវការខ្យល់

c. ត្រូវការខ្យល់O2 និងមិនចាំបាច់ខ្យល់O2 ក៏បាន

d. ត្រូវឧស្ម័នការបូនិក + ខ្យល់ O2

38 / 60

បាក់តេរីមានរូបរាងមូលដ្ឋានបីបែប?

a. Helical, Icosahedral, Complex

b. Icosa,hedral, Complex, Coccus (sphere)

c. Spirillum (spirals ), Coccus (sphere) ,Bacillus(rods)

d. Complex Helical,Bacillus(rods)

39 / 60

សេចក្តីត្រូវការពិសេស ( besoins srécifique ) របស់បាក់តេរី?

a. Acides amines , Base pyuvique , ATP

b. ATP , Glucose -6-Phosphate , glucose

c. Vitamine, base pyruvique , acide amine

d. ATP , Glucose -6-Phosphate , glucose and Vitamine, base pyruvique , acide amine ត្រឹមត្រូវ

40 / 60

បាក់តេរីខ្លះមិនបង្កអោយមានជំងឺ ( non pathogéne ) អាចរស់នៅក្នុងmilieu?

a. milieu base ក៏បាន acide ក៏បាន

b. milieu acide

c. milieu base

d. milieu acide + base

41 / 60

ពពួកបាក់តេរីដែលគ្មាន peptide-glycane តែមាន enveloppe externe និងភ្នាសcytoplasmique ហៅថា ?

a. Protoplastes

b. Mycoplasme

c. Sphéroplaste

d. Mésophile

42 / 60

ដើម្បីរស់ បាក់តេរីការចំណីអាហារប៉ុន្មានភាគរយ នៃ Ration totale សំរាប់ការរស់នៅក្នុងធម្មជាតិ?

a. 1/500

b. 1/400

c. 1/600

d. 1/300

43 / 60

ក្នុងការជ្រាបចូលនៃសារធាតុនិងចំណីអាហាររបស់បាក់តេរីករណី forme complex មុននឹងបាក់ តេរីយកទៅប្រើបានត្រូវការរងការបំបែកដោយ Exoenzyme ជាមុនទើបបានជាម៉ូលេគុលតូចៗ ករណីនេះមានម៉ូលលេគុលមួយចំនួនតូចអាចឆ្លងកាត់ membrame cytoplasmique ដូចជា?

a. O2 , H2O , Nacl , acide gras

b. CO2 , O2 , acide gras , Nacl

c. CO2 , O2 , acide gras

d. Co2, O2, acide gras, polyose

44 / 60

អ្វីទៅដែលហៅថា Ration totale របស់បាក់តេរី?

a. Ration de croissance +បរិមាណចំណីអាហារសំរាប់លូតលាស់ដល់បាក់តេរី

b. Ration d’entretien, បរិមាណចំណីអាហារទ្រទ្រង់បាក់តេរី and Ration de croissane

c. Ration d’entretien and បរិមាណចំណីអាហារទ្រទ្រង់បាក់តេរី

d. Ration de croissance and បរិមាណចំណីអាហារទ្រទ្រង់បាក់តេរី

45 / 60

យើងប្រើ Microscope optique ពិនិត្យក្រោយដាក់ព៌ណ ៖ អាចពិនិត្យយ៉ាងច្បាស់លាស់ពីរូបរាង និង ចំណុចសំខាន់ៗ ។ អាចដឹងពីរចនាសម្ព័ន្ធ អាចដឹងពី?

a. បាក់តេរី Grams positif ឬ Grams négatif

b. បាក់តេរី Grams positif

c. ពីចលនា (mobilité ) រូបរាង ( forme )

d. បាក់តេរី Grams négatif

46 / 60

សេចក្តីត្រូវការ (Les besoins nutritifs ) របស់បាក់តេរីផ្នែករូបធាតុក្នុងបរិមាណច្រើនមាន?

a. Carbon(C). Hydrogène(H) .Azote (N) .oxygène(O)

b. Ca . Mg. K

c. Carbon(C). Hydrogène(H).Azote(N) +O2 . phosphore (P) Fer (Fe)

d. phosphore (P) Fer (Fe) . Ca . Mg. K

47 / 60

បរិមាណចំណីអាហារសំរាប់ទ្រទ្រង់ជីវិតបាក់តេរីហៅថា?

a. Ration totale

b. ration de crosissance

c. ration de crosissance and Ration d’entretien

d. Ration d’entretien

48 / 60

បាក់តេរីប្រភេទ psychrophile អាចរស់នៅក្នុងសីតុណ្ហភាពជាមធ្យម?

a. លើសពី 20 ˚C

b. ក្រោម 20 ˚C

c. ក្រោម 40 ˚C

d. លើសពី 30 ˚C

49 / 60

A patient attends the surgery with bilateral swelling of the parotid salivary glands. Which condition are they suffering from?

a. Mumps

b. A. Measles

c. Rubella

d. Poliomyelitis

50 / 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 Spirochetes

c. Fusobacterium nucleatum and Actinomyces viscosus

d. Staphylococcus aureus and Streptococcus mutans

51 / 60

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?

a. Herpes simplex

b. Epstein-Barr

c. Herpes zoster

d. Paramyxovirus

52 / 60

Which microorganism implicated in pit and fissure caries?

a. Staphylococcus aureus

b. Streptococcus mutans

c. Streptococcus mitis

d. Actinimyces viscosus

53 / 60

Which of the following statements on Prevotella Intermedia are true:?

a. Implicated in periodontal disease in association with P. gingivalis

b. Microaerophilic

c. Implicated in dental Caries in association with Aggregatibacter actino- mycetemcomitans.

d. Black pigmented Gram-positive

54 / 60

Certain strains of Streptococcus mutans?

a. Are cause of infective meningitides

b. Cause of periodontal disease by the production of lactic and acids from fermentation of sugars

c. Extracellular glucan production.

d. Cause dental caries by the production of lactic and other acids, from fermentation of sugars

55 / 60

There are some main routes of infection in oral cavity, which one is inexact?

a. Transferred by insects bite.

b. Transferred by hands or objects

c. Required by transient flora

d. Transferred through the air on dust particles or water droplets

56 / 60

Primary herpesvirus infections may cause:?

a. Herpes labialis

b. Herpetic gingivostomatitis

c. Herpes zoster

d. Meningititis

57 / 60

Toxins or enzymes which are not produced by streptococcus pyogenes?

a. Streptokinase

b. Hyaluronides

c. Phosphate

d. Hemolysin

58 / 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. Lactobacillus

c. Streptococcus

d. Staphylococcus

59 / 60

Coxsakievirus have been found to replicate in the?

a. Reticuloendothelial system

b. Small bowel

c. Submucosal lymph tissue

d. Sensory nerve

60 / 60

AIDS virus is ?

a. Retro virus

b. RNA virus

c. DNA virus

d. Enterovirus

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និស្សិតអាចប្រាប់មកកាន់ពួកយើងបានដើម្បីកែកំហុស ឬអំពីបញ្ហាដោយអចេតនាណាមួយដែលកើតមានកំឡុងពេលធ្វើតេស្ត