Oral Microbiology Test

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1 / 60

Certain strains of Streptococcus mutans?

a. Are cause of infective meningitides

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

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

d. Extracellular glucan production.

2 / 60

Fusobacterium Nucleatum 😕

a. Plays a crucial role in the beginning of periodontal disease

b. Implicated in Dental caries

c. Black pigmented Gram-negative microorganism

d. Cause scarlet fever

3 / 60

The virulence of Porphyromonas gingivalis is partly due to?

a. Hyaluronic acid

b. Cytotoxins

c. Proteases, haemolysin and collagenase

d. Adhesins

4 / 60

Toxins or enzymes which are not produced by streptococcus pyogenes?

a. Phosphate

b. Streptokinase

c. Hyaluronides

d. Hemolysin

5 / 60

Elderly patients sometimes present with a fungal infection of the palate, beneath a denture,referred to as denture stomatitis. Which organism causes this condition?

a. Herpes simplex

b. Candida albicans

c. Actinomyces

d. Staphylococcus aureus

6 / 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. Lactobacillus

c. Staphylococcus

d. Bacteroides

7 / 60

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

a. បាក់តេរី Grams positif ឬ Grams négatif

b. ពីចលនា (mobilité ) រូបរាង ( forme )

c. បាក់តេរី Grams négatif

d. បាក់តេរី Grams positif

8 / 60

virus មានចរិកលក្ខណៈ នៃភាវរស់នៅរបស់វាទាំងអស់ចំនួន?

a. បី

b. ប្រាំ

c. ប្រាំមួយ

d. បួន

9 / 60

ក្នុងការជ្រាបចូលនៃចំណីអាហាររបស់បាក់តេរី perméase មានប៉ុន្មានប្រភេទ ?

a. 6ប្រភេទ

b. 4ប្រភេទ

c. 5ប្រភេទ

d. 3ប្រភេទ

10 / 60

បាក់តេរីប្រភេទ themophile អាចរស់នៅក្នុងសីតុណ្ហភាពជាមធ្យមលើសពី?

a. 37 ˚C

b. 40 ˚C

c. 30 ˚C

d. 20 ˚C

11 / 60

បាក់តេរីប្រភេទ Mésophile អាចរស់នៅក្នុងសីតុណ្ហភាព?

a. 10-20 ˚C

b. 20-40 ˚C

c. 10-15 ˚C

d. 40-50 ˚C

12 / 60

បាក់តេរីណាខ្លះដែល sensible និងកាំរស្មី ultra violet , កាំរស្មី X និងពន្លឺ?

a. ពពួកបាក់តេរី gram (+)

b. ពពួកបាក់តេរី gram(-)

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

d. ពពួក Entérobactérie

13 / 60

ពពួកបាក់តេរីដែលគ្មាន peptide-glycane តែមាន enveloppe externe និងភ្នាសcytoplasmique ហៅថា ?

a. Sphéroplaste

b. Mycoplasme

c. Mésophile

d. Protoplastes

14 / 60

Paroi bacterie gram négatif មានលក្ខណៈ?

a. ស្តើង អាល់កុលមិនអាចជ្រាបចូលបាន

b. ស្តើង អាល់កុលអាចជ្រាបហើយ bactérie ពណ៍ខៀវ

c. ក្រាស់ អាល់កុលអាចជ្រាប ហើយ bactérie ពណ៍ខៀវ

d. ស្តើង អាល់កុលអាចជ្រាប ហើយ bactérie ពណ៍ក្រហម

15 / 60

បាក់តេរី Aérobies strictes គឺពពួកបាក់តេរីដែលត្រូវរស់ និង លូតលាស់បានដោយ?

a. ត្រូវការតែខ្យល់ O2

b. មិនត្រូវការខ្យល់

c. ត្រូវការខ្យល់O2 និងមិនចាំបាច់ខ្យល់O2 ក៏បាន

d. ត្រូវឧស្ម័នការបូនិក + ខ្យល់ O2

16 / 60

បាក់តេរី Doderlein អាចរស់នៅក្នុង milieu?

a. milieu base

b. milieu acide + base

c. milieu acide

d. milieu alcalin

17 / 60

Paroi bactérie gram positif មានលក្ខណៈ?

a. ក្រាស់ មិនអាចជ្រាបអាល់កុល ហើយ bactérie ពណ៍ក្រហម

b. ក្រាស់ មិនអាចជ្រាបអាល់កុល ហើយ bactérie ពណ៍ស្វាយ

c. ក្រាស់ អាចជ្រាបអាល់កុល bactérie ពណ៍ស្វាយ

d. ស្តើង មិនជ្រាបអាល់កុល ហើយ bactérie ពណ៍ស្វាយ

18 / 60

បាក់តេរីមានរូបរាងមូលដ្ឋានបីបែប?

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

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

c. Helical, Icosahedral, Complex

d. Complex Helical,Bacillus(rods)

19 / 60

សេចក្តីត្រូវការផ្នែកថាមពល ( besoins énergétique )សំរាប់ធ្វើសំយោគម៉ូលេគុលដែលជា សារធាតុសំខាន់ក្នុងការបង្កើតថាមពលរបស់បាក់តេរី?

a. ជាតិស្ករ ,ATP , A cétyl co-A , Glucose-6 Phosphate

b. carbone , Phosphore , Calcium, ជាតិស្ករ

c. ATP , ជាតិស្ករ , Calcium , O2

d. carbone , Phosphore , Calcium

20 / 60

មធ្យោបាយសិក្សា bacteria , virus and fungi 😕

a. Transmission Electron Microscope

b. All are corrects

c. Electron Microscope

d. Optical microscope

21 / 60

សេចក្តីត្រូវការ (Les besoins nutritifs ) របស់បាក់តេរីផ្នែករូបធាតុក្នុងបរិមាណច្រើនមាន?

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

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

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

d. Ca . Mg. K

22 / 60

ភាគច្រើននៃពពួកបាក់តេរីធ្វើការលូតលាស់នៅ pH?

a. pH : 9-10

b. pH : 7-7.5

c. pH 6-6.5

d. pH : 8-9

23 / 60

បាក់តេរីខ្លះមិនបង្កអោយមានជំងឺ ( non pathogéne ) អាចរស់នៅក្នុងmilieu?

a. milieu acide + base

b. milieu base

c. milieu acide

d. milieu base ក៏បាន acide ក៏បាន

24 / 60

Following can be used for cultivation of viruses EXCEPT:?

a. Blood agar.

b. Diploid cell line

c. Cell cultures

d. Primary cell

25 / 60

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

a. Actinomyces viscsus

b. Streptococcus sanguinis

c. Streptococcus milleri

d. Actinomyces israelii.

26 / 60

Which of the following statements on chronic periodontitis is INEXACTE?

a. Prevalence and severity decrease with age

b. 95% of all periodontal diseases.

c. Most prevalent disease globally

d. Morbidity 70–80%

27 / 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. Streptococcus.

c. Spirochaetes

d. Staphylococcus

28 / 60

The human body provides a favorable habitat for microorganisms. Which of the following does not contribute to this favorable habitat?

a. Constant source of nourishment

b. Low levels of moisture

c. Stable temperature

d. Relatively stable pH.

29 / 60

Which of the following statements on aggressive periodontitis is EXACTE?

a. Initiation is onset of puberty

b. 95% of all periodontal diseases.

c. Prevalence and severity decrease with age

d. Most prevalent disease globally

30 / 60

Main predisposing factors of acute necrotizing ulcerative gingivitis is:?

a. Intake of fermentable carbohydrates.

b. Host factors

c. Severe malnutrition

d. Dental caries

31 / 60

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

a. unbroken skin

b. lysozyme in saliva

c. cilia in the respiratory tract

d. cytotoxic T cells.

32 / 60

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

a. Probiotics replacement of cariogenic bacteria

b. Plaque-free by routine oral hygiene measures.

c. Stopping or reducing between-meal consumption of carbohydrates

d. Increasing cariogenic flora

33 / 60

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

a. Gram-negative anaerobes predominate in chronic periodontitis

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

c. Gram-positive cocci predominate in healthy gingival crevice

d. facultative anaerobes predominate in gingivitis.

34 / 60

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

a. Wearing gloves after removal of all hand jewellery.

b. Wearing headgear for all operational procedures

c. Wearing a single face mask for 3 h

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

35 / 60

An abortive infection is one in which: ?

a. Progeny virus is not produced

b. Transplacental infection of the fetus occurs

c. The infected cells are killed

d. Cell multiplication is stopped.

36 / 60

Which of the following statements on dentoalveolar abscess is true?

a. it is often precipitated by bacteria from the systemic route (anachoresis)

b. it is frequently implicated as a cause of brain abscess

c. it is a infection of sublingual and submandibular spaces

d. it often resolves without antibiotics after adequate drainage.

37 / 60

Which of the following is associated with dental caries?

a. Streptococcus pneumonia

b. Staphylococcus aureus.

c. Lactococcus lactis

d. Streptococcus mutans

38 / 60

Which of the following disease most commonly afflicts human?

a. Periodontal disease

b. Dentoalveolar abscess

c. Ludwig’s angina

d. Periodontal abscess.

39 / 60

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

a. Streptococcus

b. Bacillus.

c. Escherichia

d. Staphylococcus

40 / 60

Caries, all are true except:?

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

b. Fluorides help in reducing caries incidence.

c. Smooth surface caries occur due to streptococcus mutans

d. Lactobacillus is the main causative organism in plaque

41 / 60

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

a. Candida albicans

b. Ph. Heng Kanika

c. Hepatitis G

d. Streptococcus pyogenes

e. Influenza.

42 / 60

True about caries, all EXCEPT:?

a. Demineralization of enamel.

b. Microorganisms play the most essential role

c. Not due to microorganisms

d. Chronic endogenous infection

43 / 60

Which of the following statements on dental caries is INEXACTE?

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

b. Carious lesion is result of demineralization of enamel

c. Commonly associated with malnutrition and possibly systemic diseases

d. Chronic endogenous infection caused by normal oral commensal flora

44 / 60

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

a. Tooth mobility and migration

b. Irregular alveolar bone loss around teeth

c. Gross gingival inflammation, fibrosis and some shrinkage

d. Inflamed, red, shiny and bleeding gingivae.

45 / 60

Microorganisms play the most essential role.?

a. Streptococcus anginosus.

b. Streptococcus mutans

c. Streptococcus bovis

d. Streptococcus agalactiae

e. Dental caries is associated with:

46 / 60

Oral opportunistic infection happens when:?

a. An organism that usually is nonpathogenic has no opportunity to cause disease

b. An organism that usually is pathogenic causes disease

c. An organism that usually is nonpathogenic causes disease

d. An organism that usually is pathogenic becomes normal flora

47 / 60

Antimicrobial against Porphyromonas gingivalis is 😕

a. Erythromycin

b. Vancomycin

c. Kanamycin

d. Metronidazole

48 / 60

In dental caries, the pathogenic factor is 😕

a. Good oral hygiene

b. Remineralization ( fluoride, Calcium, Phosphate)

c. Acid producing bacteria

d. Saliva flow and components

49 / 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 2

d. Phase 1

50 / 60

Major bacteria cause aggressive periodontitis?

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

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

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

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

51 / 60

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

a. B. Actinomyces

b. D. Gonococcus

c. C. Prevotella

d. A. Streptococcus

52 / 60

A bacterium from buccal mucosa that can cause lung infection in chronic obstructive pulmonary infections in cystic fibrosis patients is:?

a. Pseudomonas aeruginosa

b. Mycobacterium tuberculosis

c. Klebsiella pneumoniae

d. Streptococcus pneumoniae

53 / 60

Strategy to control of biofilm pH in oral biofilm:?

a. Inhibition of key microbial enzyme

b. Antiflammatory agents

c. Generating nutrients

d. Fluoride

54 / 60

Principal Rods Gram negative bacteria found in oral cavity:?

a. Lactobacillus

b. Porphyromonas

c. Corynebacterium

d. Eubacterium

55 / 60

Specificity of Anaerobic bacteria, except:?

a. Grow on anaerobic media culture

b. Black pigmentation on culture

c. Incubation culture in 1-2 days

d. Foul odor when opening anaerobic jar or bag

56 / 60

Diseases are always found in oral cavity, except 😕

a. Tuberculosis

b. Gonococci

c. Typhoid fever

d. Syphilis

57 / 60

Microorganisms in oral tissue can cause 😕

a. Only local infection

b. Local infection

c. Both, local and systemic infection

d. Systemic infection

58 / 60

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 😕

a. Streptococcus pneumoniae

b. Pseudomonas aeruginosa

c. Mycobacterium tuberculosis

d. Klebsiella pneumoniae

59 / 60

Infection in oral cavity by oral flora, which proposition is inexact?

a. Changes in exposure to antiseptic

b. Administration of antibiotics

c. Changes in salivary flow

d. Changes in the immune system

60 / 60

Which bacteria that is not always presence in saliva:?

a. Streptococcus agalactiae

b. Streptococcus salivarius

c. Streptococcus oralis

d. Streptococcus mitis

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និស្សិតអាចប្រាប់មកកាន់ពួកយើងបានដើម្បីកែកំហុស ឬអំពីបញ្ហាដោយអចេតនាណាមួយដែលកើតមានកំឡុងពេលធ្វើតេស្ត