Oral Microbiology Test

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1 / 60

Causative agent of scarlet fever?

a. Staphylococcus aureus

b. Streptococcus pyogens

c. None of these

d. Streptococcus viridans

2 / 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. Staphylococcus aureus and Streptococcus mutans

d. Fusobacterium nucleatum and Spirochetes

3 / 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. Staphylococcus

b. Streptococcus

c. Lactobacillus

d. Bacteroides

4 / 60

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

a. Required by transient flora

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

c. Transferred by insects bite.

d. Transferred by hands or objects

5 / 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

6 / 60

The organisms most commonly associated with root caries are ?

a. Actinomyces viscosus

b. Porphyromonas gingivalis

c. Fusobacterium Nucleatum

d. Staphylococcus aureus

7 / 60

Coxsakievirus have been found to replicate in the?

a. Submucosal lymph tissue

b. Reticuloendothelial system

c. Sensory nerve

d. Small bowel

8 / 60

During AIDS, HIV infects?

a. B Lymphocytes

b. CD4 lymphocytes

c. CD3 lymphocytes

d. CD2 lymphocytes

9 / 60

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

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

b. Black pigmented Gram-positive

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

d. Microaerophilic

10 / 60

Which of the following organisms is most likely to be implicated in dental caries?

a. Escherichia coli

b. Staphylococcus aureus

c. Streptococcus sorbinus

d. Staphylococcus epidermidis

11 / 60

Toxins or enzymes which are not produced by streptococcus pyogenes?

a. Streptokinase

b. Phosphate

c. Hemolysin

d. Hyaluronides

12 / 60

How to manage dentoalveolar abscess?

a. Probiotics replacement of cariogenic bacteria

b. Initial local debridement.

c. Reducing cariogenic flora

d. Removing source of infection and prescribing antibiotics

13 / 60

What is the cause of death in Ludwig angina?

a. Wall rupture.

b. Dysrhythmia

c. Pneumonia

d. Asphyxia

14 / 60

True about caries, all EXCEPT:?

a. Not due to microorganisms

b. Microorganisms play the most essential role

c. Demineralization of enamel.

d. Chronic endogenous infection

15 / 60

A facultative anaerobic is:?

a. Ordinarily an anaerobe but can grow with O2

b. Ordinarily an aerobe but can grow in absence of O2.

c. Only grow anaerobically

d. Only grow in the presence of O2

16 / 60

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

a. ATP synthesis

b. A capsule.

c. Cell wall

d. Flagella

17 / 60

The following infectious agents are likely to be transmitted in dental care settings:?

a. Hepatitis G

b. Streptococcus pyogenes

c. Influenza.

d. Ph. Heng Kanika

e. Candida albicans

18 / 60

Widely accepted theory of dental caries is 😕

a. Proteolytic chelation theory

b. Proteolytic theory

c. Autoimmune theory.

d. Acidogenic theory

19 / 60

Normal flora help protect the body from pathogens … ?

a. by sharing plasmids with pathogenic bacteria

b. by attacking pathogenic bacteria

c. by competing with other bacteria

d. by secreting histamines.

20 / 60

The dietary carbohydrate most likely involved in etiology of dental caries is 😕

a. Xylitol.

b. Dextran

c. Sucrose

d. Polysaccharide

21 / 60

Which of the following statements on dental caries is INEXACTE?

a. Chronic endogenous infection caused by normal oral commensal flora

b. Commonly associated with malnutrition and possibly systemic diseases

c. Carious lesion is result of demineralization of enamel

d. Destruction of tissues of tooth by bacterial fermentation of dietary carbohydrates.

22 / 60

Following can be used for cultivation of viruses EXCEPT:?

a. Cell cultures

b. Diploid cell line

c. Blood agar.

d. Primary cell

23 / 60

Gram staining reflects in bacteria?

a. presence or absence of nucleus.

b. differences in bacterial metabolism

c. differences in the bacterial plasmatic membrane

d. differences in the cell wall structure

24 / 60

An abortive infection is one in which: ?

a. Progeny virus is not produced

b. Transplacental infection of the fetus occurs

c. Cell multiplication is stopped.

d. The infected cells are killed

25 / 60

Dentoalveolar abscess is treated by:?

a. Periodontal flap procedure

b. Drainage through the gingival sulcus or by an external incision.

c. Gingivoplasty

d. Gingivectomy

26 / 60

Which of the following statements on periodontal disease is INEXACT?

a. Can be controlled by using mechanical cleansing techniques.

b. Disorders of supporting structures of teeth

c. Manage by restoration

d. One of major diseases afflicting humankind

27 / 60

Which of the following statements on complication of Ludwig’s angina is INEXACTE?

a. Respiratory tract infections.

b. Death due to asphyxiation

c. Airway obstruction due to edema of glottis

d. pread of infection to masticator

28 / 60

The mutans group of streptococci are key cariogenic pathogens. Which of the following belongs to the mutans group?

a. Streptococcus pneumonia.

b. Streptococcus saprophyticus

c. Streptococcus pyogenes

d. Streptococcus mutans

29 / 60

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

a. Dental caries

b. Osteomylitis.

c. Gingivitis

d. Periodontitis

30 / 60

Which genus of bacterium contributes to plaque, caries, gingivitis, and periodontal disease?

a. Streptococcus

b. Staphylococcus

c. Bacillus.

d. Escherichia

31 / 60

Viruses can be cultivated in?

a. Blood culture.

b. Lab media

c. Tissue culture

d. Broth

32 / 60

Which of the following statements on aggressive periodontitis is EXACTE?

a. 95% of all periodontal diseases.

b. Initiation is onset of puberty

c. Most prevalent disease globally

d. Prevalence and severity decrease with age

33 / 60

Mouthwashes used for controlling oral malodor should contain?

a. Sugar to make them more palatable to consumers

b. Antibacterial agent

c. Alcohol

d. Xylitol.

34 / 60

Principal Rods Gram positive bacteria found in oral cavity:?

a. Prevotella

b. Simonsiella

c. Eikenella

d. Actinomyces

35 / 60

A major bacteria that is responsible in facilitating adhesion by other bacteria is:?

a. Staphylococcus stains

b. Streptococcus strains

c. Fusobacterium nucleatum

d. Enterococcus stains

36 / 60

Principal Rods Gram negative bacteria found in oral cavity:?

a. Lactobacillus

b. Porphyromonas

c. Corynebacterium

d. Eubacterium

37 / 60

In dental caries, the pathogenic factor is 😕

a. Remineralization ( fluoride, Calcium, Phosphate)

b. Saliva flow and components

c. Acid producing bacteria

d. Good oral hygiene

38 / 60

The most common bacteria that are always presence in mouth as a normal flora, which proposition is inexact?

a. A. Streptococcus

b. B. Actinomyces

c. C. Prevotella

d. D. Gonococcus

39 / 60

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

a. Phase 4

b. Phase 2

c. Phase 3

d. Phase 1

40 / 60

Major bacteria usually cause dental caries:?

a. Streptococcus pneumoniae, Lactobacilli, Actinomyces vicosus

b. Mutans Streptococci, Lactobacilli, Actinomyces vicosus

c. Mutans Streptococci, Staphylococcus aureus, Actinomyces vicosus

d. Mutans Streptococci, Lactobacilli, Clostridium

41 / 60

The most common bacterium that is responsible for tonsillitis and pharyngitis is:?

a. Streptococcus mitis

b. Group-B beta hemolytic Streptococcus ( Streptococcus agalactiae)

c. Group-A beta hemolytic Streptococcus ( Streptococcus pyogenses)

d. Streptococcus mutans

42 / 60

The comment bacterium causes dental caries:?

a. Staphylococcus aureus

b. Mutans Streptococci

c. E.coli

d. Pseudomonas aeruginosa

43 / 60

Which bacteria that is not always presence in saliva:?

a. Streptococcus agalactiae

b. Streptococcus salivarius

c. Streptococcus mitis

d. Streptococcus oralis

44 / 60

Strategy to control of rendox potential in oral biofilm:?

a. Fluoride

b. Stimulate base production

c. Oxygenating agents

d. Inhibition of key microbial enzyme

45 / 60

virusមានរូបរាងមូលដ្ឋានបីបែប?

a. Helical, Icosahedral, Complex

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

c. Helical, Icosahedral ,Spirillum (spirals )

d. Complex Helical,Bacillus(rods)

46 / 60

ការជ្រាបចូលនៃសារធាតុ និងចំណីអាហាររបស់បាក់តេរី កាលណាសារធាតុជា forme complex មុននិងបាក់តេរីយកទៅប្រើប្រាស់បានត្រូវរងការបំបែកដោយexoenzyme ជាមុនសិន សារធាតុទាំងនោះមាន?

a. Polymère, ATP ,Vitamine

b. Polymére , acide amine, ATP

c. Base pyruvique ,Vitamine, ATP

d. Protéine , polymére, polyose

47 / 60

ភាគច្រើននៃពពួកបាក់តេរីធ្វើការលូតលាស់នៅ pH?

a. pH 6-6.5

b. pH : 8-9

c. pH : 9-10

d. pH : 7-7.5

48 / 60

Paroi នៃបាក់តេរី Gram. Positif ផ្សំដោយ?

a. Céramique and Peptido-glycane ត្រឹមត្រូវ

b. gelatin

c. Peptido-glycane

d. Céramique

49 / 60

បរិមាណចំណីអាហារសំរាប់សាងសង់និង ដើម្បីថាមពលហៅថា?

a. Ration d’entretien

b. Ration totale

c. ration de croissance

d. Ration d’entretien and Ration totale

50 / 60

អ្វីទៅដែលហៅថា Ration totale របស់បាក់តេរី?

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

b. Ration d’entretien and បរិមាណចំណីអាហារទ្រទ្រង់បាក់តេរី

c. Ration de croissance and បរិមាណចំណីអាហារទ្រទ្រង់បាក់តេរី

d. Ration de croissance +បរិមាណចំណីអាហារសំរាប់លូតលាស់ដល់បាក់តេរី

51 / 60

បាក់តេរីប្រភេទ psychrophile អាចរស់នៅក្នុងសីតុណ្ហភាពជាមធ្យម?

a. លើសពី 20 ˚C

b. ក្រោម 40 ˚C

c. ក្រោម 20 ˚C

d. លើសពី 30 ˚C

52 / 60

ក្នុងការជ្រាបចូលនៃសារធាតុនិងចំណីអាហាររបស់បាក់តេរីប្រភេទ perméase មាន?

a. Perméase á ions

b. Perméase á protein , perméase á acide amines

c. Perméase á sucre , Perméase á glucose

d. Perméase á ions (K,PO4, SO4) and Perméase á protein , perméase á acide amines

53 / 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

54 / 60

ពពួកបាក់តេរីដែលគ្មាន peptide-glycane តែមាន enveloppe externe និងភ្នាសcytoplasmique ហៅថា ?

a. Mésophile

b. Sphéroplaste

c. Protoplastes

d. Mycoplasme

55 / 60

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

a. បាក់តេរី Grams négatif

b. ពីចលនា (mobilité ) រូបរាង ( forme )

c. បាក់តេរី Grams positif ឬ Grams négatif

d. បាក់តេរី Grams positif

56 / 60

បរិមាណចំណីអាហារសំរាប់ទ្រទ្រង់ជីវិតបាក់តេរីហៅថា?

a. ration de crosissance and Ration d’entretien

b. ration de crosissance

c. Ration totale

d. Ration d’entretien

57 / 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-anaérobie facultative and érobies strictes , Micro-aérophiles, anaérobies stricte

d. Aérobies strictes , Micro-aérophiles, anaérobies stricte

58 / 60

Paroi bacterie gram négatif មានលក្ខណៈ?

a. ស្តើង អាល់កុលអាចជ្រាប ហើយ bactérie ពណ៍ក្រហម

b. ស្តើង អាល់កុលមិនអាចជ្រាបចូលបាន

c. ស្តើង អាល់កុលអាចជ្រាបហើយ bactérie ពណ៍ខៀវ

d. ក្រាស់ អាល់កុលអាចជ្រាប ហើយ bactérie ពណ៍ខៀវ

59 / 60

សេចក្តីត្រូវការពិសេស ( besoins srécifique ) របស់បាក់តេរី?

a. Vitamine, base pyruvique , acide amine

b. Acides amines , Base pyuvique , ATP

c. ATP , Glucose -6-Phosphate , glucose

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

60 / 60

Anaérobies strictes គឺពពួកបាក់តេរីដែលអាចរស់ និងលូតលាស់បានទាល់តែ?

a. មានខ្យល់ O2 ល្មម

b. មានខ្យល់ O2ច្រើន

c. គ្មានខ្យល់ O2 សោះ

d. មានខ្យល់ O2 តិច

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