Oral Microbiology Test

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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*

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1 / 60

During AIDS, HIV infects?

a. CD3 lymphocytes

b. B Lymphocytes

c. CD4 lymphocytes

d. CD2 lymphocytes

2 / 60

Mumps virus is belonging to?

a. Orthomyxoviridae

b. Paramyxoviridae

c. None of these

d. Retroviriae

3 / 60

Certain strains of Streptococcus mutans?

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

b. Are cause of infective meningitides

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

d. Extracellular glucan production.

4 / 60

Fusobacterium Nucleatum 😕

a. Isolated from monomicrobial infections

b. Produce proinflammatory cytokines and up-regulating the inflammatory response

c. Non capsulate diplococci

d. Gram-positive, strictly anaerobic

5 / 60

Porphyromonas gingivalis:?

a. Are non-capsulated

b. Are isolated from many extra oral sites

c. Are Gram-positive pleomorphic rods

d. Are aggressive periodontal pathogens

6 / 60

Main causative organism of chicken pox is?

a. Varicella Zoster virus

b. Mumps virus

c. Fox virus

d. Measles virus

7 / 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. Bacteroides

c. Streptococcus

d. Lactobacillus

8 / 60

The organisms most commonly associated with root caries are ?

a. Staphylococcus aureus

b. Porphyromonas gingivalis

c. Fusobacterium Nucleatum

d. Actinomyces viscosus

9 / 60

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

a. Black pigmented Gram-positive

b. Microaerophilic

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

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

10 / 60

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

a. Streptococcus sorbinus

b. Escherichia coli

c. Staphylococcus epidermidis

d. Staphylococcus aureus

11 / 60

Analytical techniques for monitoring biofilms by “Indirect detection” 😕

a. Detection of proteins by molecular biology technique

b. Microscopy techniques

c. Detection of DNA by molecular biology technique

d. High Pressure Liquid Chromatography (HPLC)

12 / 60

Major bacteria cause periodontitis 😕

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

b. Fusobacterium nucleatum, Petostreptococcus micros, Streptococci, Pneumococcus

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

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

13 / 60

Principal Rods Gram positive bacteria found in oral cavity:?

a. Prevotella

b. Eikenella

c. Actinomyces

d. Simonsiella

14 / 60

Factor that does not influence to dental caries?

a. Individual factor

b. Size and form of teeth

c. Substrate for microorganisms

d. Duration and frequency of exposure

15 / 60

Steps in order for biofilm formation:?

a. Coadhesion , adhesion, colonization, maturation and detachment

b. Colonization , adhesion, coadhesion , maturation and detachment

c. Adhesion, colonization, coadhesion , maturation and detachment

d. Maturation and detachment, adhesion, colonization, coadhesion

16 / 60

Major bacteria cause aggressive periodontitis?

a. Prevotella intermedia, Fusobacterium nucleatum, Porphyromonas endodontalis, Prevotella tannerae

b. Actinobaccilus actinomycetemcomitans, Fusobacterium nucleatum, Porphyromonas endodontalis, Prevotella tannerae

c. Capnocytophaga sputigena, Fusobacterium nucleatum, Porphyromonas endodontalis, Prevotella tannerae

d. Eikenella corrodens, Capnocytophaga sputigena, Actinobaccilus actinomycetemcomitans, Prevotella intermedia

17 / 60

Principal Cocci Gram positive bacteria found in oral cavity:?

a. Neisseria

b. Veillonella

c. Moraxella

d. Peptostreptococcus

18 / 60

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

19 / 60

Strategy to control of rendox potential in oral biofilm:?

a. Fluoride

b. Inhibition of key microbial enzyme

c. Stimulate base production

d. Oxygenating agents

20 / 60

A bacterium that never found in tooth surface:?

a. Streptococcus mutans

b. Streptococcus anginosus

c. Streptococcus pneumoniae

d. Streptococcus mitis

21 / 60

Principal Rods Gram negative bacteria found in oral cavity:?

a. Porphyromonas

b. Lactobacillus

c. Eubacterium

d. Corynebacterium

22 / 60

បាក់តេរីដែលធ្វើអោយពុលដល់ចំណីអាហារកំប៉ុងឈ្មោះអ្វី ?

a. Clostridium

b. Streptocoque

c. Staphylocoque

d. Pneumcoque

23 / 60

ពពួកបាក់តេរីណាដែលអាចរស់នៅ បានដោយខ្យល់ O2 រី អត់សោះក៏បាន?

a. Entérobactérie

b. gonocoque

c. Eschérichia-coli

d. Salmonella

24 / 60

បាក់តេរីប្រភេទ themophile អាចរស់នៅក្នុងសីតុណ្ហភាពជាមធ្យមលើសពី?

a. 20 ˚C

b. 40 ˚C

c. 30 ˚C

d. 37 ˚C

25 / 60

បាក់តេរីមានរូបរាងមូលដ្ឋានបីបែប?

a. Complex Helical,Bacillus(rods)

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

c. Helical, Icosahedral, Complex

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

26 / 60

គេប្រើl Microscope optique ពិនិត្យក្នុងសភាពរស់នៅ(á l ‘état frais) គឺសិក្សាពិនិត្យពី 😕

a. បាក់តេរី Grams positif

b. បាក់តេរី Grams négatif

c. រូបរាង ( forme ) និងពីចលនា (mobilité ) ។

d. រូបរាង ( forme )

27 / 60

បាក់តេរីណាខ្លះដែល sensible និងកាំរស្មី ultra violet , កាំរស្មី X និងពន្លឺ?

a. ពពួកបាក់តេរី gram (+), gram(-) and ពពួក Entérobactérie

b. ពពួកបាក់តេរី gram (+)

c. ពពួក Entérobactérie

d. ពពួកបាក់តេរី gram(-)

28 / 60

Paroi bactérie gram positif មានលក្ខណៈ?

a. ក្រាស់ មិនអាចជ្រាបអាល់កុល ហើយ bactérie ពណ៍ស្វាយ

b. ស្តើង មិនជ្រាបអាល់កុល ហើយ bactérie ពណ៍ស្វាយ

c. ក្រាស់ មិនអាចជ្រាបអាល់កុល ហើយ bactérie ពណ៍ក្រហម

d. ក្រាស់ អាចជ្រាបអាល់កុល bactérie ពណ៍ស្វាយ

29 / 60

ក្នុងការជ្រាបចូលនៃចំណីអាហាររបស់បាក់តេរី perméase មានប៉ុន្មានប្រភេទ ?

a. 5ប្រភេទ

b. 3ប្រភេទ

c. 6ប្រភេទ

d. 4ប្រភេទ

30 / 60

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

a. CO2 , O2 , acide gras , Nacl

b. O2 , H2O , Nacl , acide gras

c. CO2 , O2 , acide gras

d. Co2, O2, acide gras, polyose

31 / 60

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

a. បាក់តេរី Grams négatif

b. បាក់តេរី Grams positif ឬ Grams négatif

c. បាក់តេរី Grams positif

d. ពីចលនា (mobilité ) រូបរាង ( forme )

32 / 60

Bactérie ដែលមិនអាចបង្កើត Spore មាន?

a. coli bacille

b. streptocoque

c. pneumocoque

d. All are corrects

e. Staphylocoque

33 / 60

សារធាតុណាខ្លះដែលប្រឆាំង និងការរីកលូតលាស់របស់បាក់តេរី?

a. សារធាតុនៃ ពួក antibiotique,នៃ ពពួក Antiseptique ខ្លាំង ,ខ្សោយ and សារធាតុនៃ ពួក Antiseptique ខ្សោយ

b. សារធាតុនៃ ពួក Antiseptique ខ្សោយ

c. សារធាតុនៃ ពួក Antiseptique ខ្លាំង

d. សារធាតុនៃ ពពួក Antiseptique

34 / 60

ពួកបាក់តេរី pseudomonas អាចរស់នៅក្នុង milieu ?

a. All are corrects

b. milieu acide + base

c. milieu acide

d. milieu base

35 / 60

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

a. Plaque-free by routine oral hygiene measures.

b. Stopping or reducing between-meal consumption of carbohydrates

c. Probiotics replacement of cariogenic bacteria

d. Increasing cariogenic flora

36 / 60

How to manage dentoalveolar abscess?

a. Initial local debridement.

b. Probiotics replacement of cariogenic bacteria

c. Removing source of infection and prescribing antibiotics

d. Reducing cariogenic flora

37 / 60

What are the predominant plaque bacteria in gingivitis?

a. Facultative anaerobia cocci (+) and Anaerobic rods (-)

b. Anaerobic cocci (-) and Facultative anaerobia rods (-).

c. Facultative anaerobia cocci (-) and Anaerobic rods (-)

d. Anaerobic cocci (+) and Facultative anaerobia cocci rods (+)

38 / 60

Communicable diseases can spread by several methods. Which is not an example of the direct transmission mode of disease spread?

a. Placental transfer.

b. Transfusion

c. Contact with contaminated food

d. Sexual intercourse

39 / 60

Viruses that persist in the cell and cause recurrent disease are considered?

a. cytopathic

b. resistant.

c. oncogenic

d. latent

40 / 60

The main causative agent of Ludwig’s angina is:?

a. Porphyromonas

b. Group A streptococci.

c. Staphylococci

d. Legionella infection

41 / 60

How to manage dental caries?

a. Eliminate primary source of infection

b. Initial local debridement with ultrasonic scaling

c. Institute surgical drainage.

d. Minimal cavity preparation techniques

42 / 60

Virus replicate by which of the following?

a. Reproduction.

b. Within a host cell

c. Cell division

d. Extracellular

43 / 60

Which of the following bacteria that is predominant in healthy condition?

a. Actinomyces viscsus

b. Streptococcus sanguinis

c. Actinomyces israelii.

d. Streptococcus milleri

44 / 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.

45 / 60

How to manage acute necrotizing ulcerative gingivitis?

a. Institute surgical drainage.

b. Tetracycline 250 mg 3 times/day for 4 weeks

c. Reducing cariogenic flora

d. Initial local debridement by ultrasonic scaling

46 / 60

True about caries, all EXCEPT:?

a. Chronic endogenous infection

b. Microorganisms play the most essential role

c. Not due to microorganisms

d. Demineralization of enamel.

47 / 60

Normal flora help protect the body from pathogens … ?

a. by competing with other bacteria

b. by secreting histamines.

c. by attacking pathogenic bacteria

d. by sharing plasmids with pathogenic bacteria

48 / 60

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

a. Commonly associated with poor and neglected oral hygiene

b. If untreated, ulcers enlarge and spread to involve marginal

c. The disease may be inherited (autosomal recessive).

d. Possibly systemic diseases

49 / 60

Which of the following vaccines would you recommend to your new female dental surgery assistant starting work with you?

a. Measles–mumps–rubella (MMR)

b. Hepatitis A

c. Hepatitis C.

d. Hepatitis B immunoglobulin

50 / 60

An example of a nonspecific chemical barrier to infection is…?

a. lysozyme in saliva

b. cilia in the respiratory tract

c. cytotoxic T cells.

d. unbroken skin

51 / 60

Widely accepted theory of dental caries is 😕

a. Autoimmune theory.

b. Proteolytic chelation theory

c. Acidogenic theory

d. Proteolytic theory

52 / 60

Which of the following statements on periodontal disease is INEXACT?

a. One of major diseases afflicting humankind

b. Manage by restoration

c. Can be controlled by using mechanical cleansing techniques.

d. Disorders of supporting structures of teeth

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

c. facultative anaerobes predominate in gingivitis.

d. Gram-negative anaerobes predominate in chronic periodontitis

54 / 60

A facultative anaerobic is:?

a. Only grow anaerobically

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

c. Ordinarily an anaerobe but can grow with O2

d. Only grow in the presence of O2

55 / 60

Which of the following is associated with dental caries?

a. Lactococcus lactis

b. Streptococcus pneumonia

c. Staphylococcus aureus.

d. Streptococcus mutans

56 / 60

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

a. Irregular alveolar bone loss around teeth

b. Tooth mobility and migration

c. Gross gingival inflammation, fibrosis and some shrinkage

d. Inflamed, red, shiny and bleeding gingivae.

57 / 60

Which of the following disease most commonly afflicts human?

a. Ludwig’s angina

b. Dentoalveolar abscess

c. Periodontal disease

d. Periodontal abscess.

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

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

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

59 / 60

Which of the following statements on clinical sign of dental caries is INEXACTE?

a. White-spot lesion.

b. Pseudomembrane (slough)

c. Chalkywhite lesion

d. Roughened and cavitation

60 / 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. Streptococcus.

b. Spirochaetes

c. Staphylococcus

d. Bacteroides

Your score is

The average score is 86%

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និស្សិតអាចប្រាប់មកកាន់ពួកយើងបានដើម្បីកែកំហុស ឬអំពីបញ្ហាដោយអចេតនាណាមួយដែលកើតមានកំឡុងពេលធ្វើតេស្ត