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

Major bacteria usually cause dental caries:?

a. Streptococcus pneumoniae, Lactobacilli, Actinomyces vicosus

b. Mutans Streptococci, Staphylococcus aureus, Actinomyces vicosus

c. Mutans Streptococci, Lactobacilli, Clostridium

d. Mutans Streptococci, Lactobacilli, Actinomyces vicosus

2 / 60

Specificity of Anaerobic bacteria, except:?

a. Incubation culture in 1-2 days

b. Grow on anaerobic media culture

c. Black pigmentation on culture

d. Foul odor when opening anaerobic jar or bag

3 / 60

Strategy to control of nutrients in oral biofilm:?

a. Inhibition of key microbial enzyme

b. Fluoride

c. Stimulate base production

d. Antimicrobial agents

4 / 60

Factor that does not influence to dental caries?

a. Duration and frequency of exposure

b. Individual factor

c. Substrate for microorganisms

d. Size and form of teeth

5 / 60

Diseases are always found in oral cavity, except 😕

a. Gonococci

b. Typhoid fever

c. Tuberculosis

d. Syphilis

6 / 60

Antimicrobial against Porphyromonas gingivalis is 😕

a. Erythromycin

b. Vancomycin

c. Metronidazole

d. Kanamycin

7 / 60

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

a. C. Prevotella

b. D. Gonococcus

c. B. Actinomyces

d. A. Streptococcus

8 / 60

Analytical techniques for monitoring biofilms by “Indirect detection” 😕

a. Detection of proteins by molecular biology technique

b. Detection of DNA by molecular biology technique

c. Microscopy techniques

d. High Pressure Liquid Chromatography (HPLC)

9 / 60

Biofilm infection is usually found in sites of primary and secondary infection except:?

a. Genital infection

b. Artificial hip implant

c. Mouth

d. Subvenous catheter

10 / 60

Microorganisms in oral tissue can cause 😕

a. Only local infection

b. Both, local and systemic infection

c. Local infection

d. Systemic infection

11 / 60

In dental caries, the protective factor is 😕

a. Acid producing bacteria

b. Antibacterials ( fluorides, Chlorhexidine, Xylitol)

c. Frequent eating / drinking of fermentable carbohydrates

d. Poor oral hygiene

12 / 60

Bacteria usually cause Necrotizing Ulcerative Gingivitis?

a. Borrelia vincentii and Eikenella corrodens

b. Borrelia vincentii and Porphyromonas endodontalis

c. Fusiform bacillus and Borrelia vincentii

d. Fusiform bacillus and Capnocytophaga sputigena

13 / 60

The organisms most commonly associated with root caries are ?

a. Porphyromonas gingivalis

b. Staphylococcus aureus

c. Fusobacterium Nucleatum

d. Actinomyces viscosus

14 / 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

15 / 60

Main causative organism of chicken pox is?

a. Varicella Zoster virus

b. Mumps virus

c. Fox virus

d. Measles virus

16 / 60

Herpagina is usually cause by?

a. Cytomegalovirus

b. Group B coxackieviruses

c. Group A coxsackieviruses

d. Hepatitis A virus

17 / 60

The virulence of Porphyromonas gingivalis is partly due to?

a. Adhesins

b. Hyaluronic acid

c. Proteases, haemolysin and collagenase

d. Cytotoxins

18 / 60

Actinobacillus actinomycetemcomitans possesses certain virulence factors that enable it to invade tissues, such as ?

a. hemolysine

b. Hyaluronidase

c. leukotoxin A

d. Streptodornas

19 / 60

Coxsakievirus have been found to replicate in the?

a. Sensory nerve

b. Small bowel

c. Reticuloendothelial system

d. Submucosal lymph tissue

20 / 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. Bacteroides

c. Staphylococcus

d. Lactobacillus

21 / 60

Porphyromonas gingivalis:?

a. Are non-capsulated

b. Are isolated from many extra oral sites

c. Are aggressive periodontal pathogens

d. Are Gram-positive pleomorphic rods

22 / 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

23 / 60

Initiation of dental caries depends upon:?

a. availability of carbohydrate food

b. viscosity of saliva

c. Localisation of acid over tooth surface.

d. formation of large amount of acid

24 / 60

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

a. Low levels of moisture

b. Constant source of nourishment

c. Relatively stable pH.

d. Stable temperature

25 / 60

Virus replicate by which of the following?

a. Cell division

b. Within a host cell

c. Extracellular

d. Reproduction.

26 / 60

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

a. Hepatitis G

b. Influenza.

c. Ph. Heng Kanika

d. Candida albicans

e. Streptococcus pyogenes

27 / 60

A facultative anaerobic is:?

a. Ordinarily an anaerobe but can grow with O2

b. Only grow anaerobically

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

d. Only grow in the presence of O2

28 / 60

Turbid dentin in carious tooth is all EXCEPT:?

a. Zone which cannot be remineralised

b. Zone of bacterial invasion

c. Zone that need not be removed before restoration.

d. Zone in which collagen is irreversibly denatured

29 / 60

Microorganism that can grow in the presence as well as in the absence of molecular oxygen is?

a. obligatory anaerobic

b. facultatively anaerobic.

c. obligatory aerobic

d. microaerobically

30 / 60

Which of the following bacteria that is predominant in chronic periodontitis?

a. Streptococcus sanguinis

b. Porphyromonas gingivalis

c. Prevotella intermedia.

d. Actinomyces viscsus

31 / 60

Dentoalveolar abscess is treated by:?

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

b. Periodontal flap procedure

c. Gingivoplasty

d. Gingivectomy

32 / 60

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

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

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

c. substituting cariogenic artificial sweeteners

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

33 / 60

Normal flora help protect the body from pathogens … ?

a. by sharing plasmids with pathogenic bacteria

b. by secreting histamines.

c. by attacking pathogenic bacteria

d. by competing with other bacteria

34 / 60

The main causative agent of Ludwig angina is:?

a. Streptococcus pneumonia

b. Staphylococci

c. Treponema pallidum

d. Fusobacteria.

35 / 60

Which of the following statements on chronic periodontitis is INEXACTE?

a. Prevalence and severity decrease with age

b. Most prevalent disease globally

c. 95% of all periodontal diseases.

d. Morbidity 70–80%

36 / 60

Which of the following statements on aggressive periodontitis is EXACTE?

a. Prevalence and severity decrease with age

b. Initiation is onset of puberty

c. Most prevalent disease globally

d. 95% of all periodontal diseases.

37 / 60

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

a. pread of infection to masticator

b. Death due to asphyxiation

c. Respiratory tract infections.

d. Airway obstruction due to edema of glottis

38 / 60

Mouthwashes used for controlling oral malodor should contain?

a. Alcohol

b. Sugar to make them more palatable to consumers

c. Xylitol.

d. Antibacterial agent

39 / 60

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

a. Possibly systemic diseases

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

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

d. Commonly associated with poor and neglected oral hygiene

40 / 60

In dentoalveolar abscess, the bacteria reach pulp by:?

a. Plaque microorganisms

b. Traumatic exposure during dental treatment

c. Primary herpetic gingivostomatitis.

d. Poor oral hygiene

41 / 60

Main predisposing factors of acute necrotizing ulcerative gingivitis is:?

a. Intake of fermentable carbohydrates.

b. Dental caries

c. Severe malnutrition

d. Host factors

42 / 60

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

a. resistant.

b. latent

c. cytopathic

d. oncogenic

43 / 60

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

a. cytotoxic T cells.

b. unbroken skin

c. cilia in the respiratory tract

d. lysozyme in saliva

44 / 60

Widely accepted theory of dental caries is 😕

a. Proteolytic chelation theory

b. Acidogenic theory

c. Proteolytic theory

d. Autoimmune theory.

45 / 60

Which is not true about Ludwig angina?

a. Caused by an acute or chronic destructive process in periodontium

b. Maintain fluid balance.

c. May need emergency tracheostomy

d. Involves submandibular space

46 / 60

Which of the following statements on dentoalveolar abscess is true?

a. it is a infection of sublingual and submandibular spaces

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

c. it often resolves without antibiotics after adequate drainage.

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

47 / 60

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

a. Bacillus.

b. Streptococcus

c. Staphylococcus

d. Escherichia

48 / 60

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

a. Porphyromonas spp.

b. Treponema pallidum

c. Streptococcus pneumonia

d. Staphylococci

49 / 60

Which of the following statements on periodontal disease is INEXACT?

a. Manage by restoration

b. Can be controlled by using mechanical cleansing techniques.

c. One of major diseases afflicting humankind

d. Disorders of supporting structures of teeth

50 / 60

Lysozyme is present in?

a. Sweat

b. Urine

c. Saliva.

d. Cerebro spinal fluid (CSF)

51 / 60

បរិមាណចំណីអាហារសំរាប់ទ្រទ្រង់ជីវិតបាក់តេរីហៅថា?

a. ration de crosissance and Ration d’entretien

b. Ration d’entretien

c. ration de crosissance

d. Ration totale

52 / 60

ពពួកបាក់តេរីដែលគ្មាន peptide-glycane តែមាន enveloppe externe និងភ្នាសcytoplasmique ហៅថា ?

a. Mésophile

b. Sphéroplaste

c. Protoplastes

d. Mycoplasme

53 / 60

សេចក្តីត្រូវការផ្នែកថាមពល ( besoins énergétique )សំរាប់ធ្វើសំយោគម៉ូលេគុលដែលជា សារធាតុសំខាន់ក្នុងការបង្កើតថាមពលរបស់បាក់តេរី?

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

b. ATP , ជាតិស្ករ , Calcium , O2

c. carbone , Phosphore , Calcium, ជាតិស្ករ

d. carbone , Phosphore , Calcium

54 / 60

Paroi នៃបាក់តេរី Gram. Positif ផ្សំដោយ?

a. Céramique and Peptido-glycane ត្រឹមត្រូវ

b. Peptido-glycane

c. Céramique

d. gelatin

55 / 60

សេចក្តីត្រូវការពិសេស ( besoins srécifique ) របស់បាក់តេរី?

a. Acides amines , Base pyuvique , ATP

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

c. ATP , Glucose -6-Phosphate , glucose

d. Vitamine, base pyruvique , acide amine

56 / 60

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

a. Co2, O2, acide gras, polyose

b. CO2 , O2 , acide gras

c. CO2 , O2 , acide gras , Nacl

d. O2 , H2O , Nacl , acide gras

57 / 60

Paroi នៃបាក់តេរី Gram negatif ផ្សំឡើងដោយ?

a. gelatin

b. céramique

c. uréine+gelatin

d. Mucopeptide

58 / 60

មធ្យោបាយសិក្សា bacteria , virus and fungi 😕

a. Electron Microscope

b. All are corrects

c. Transmission Electron Microscope

d. Optical microscope

59 / 60

Paroi bactérie gram positif មានលក្ខណៈ?

a. ក្រាស់ មិនអាចជ្រាបអាល់កុល ហើយ bactérie ពណ៍ស្វាយ

b. ក្រាស់ អាចជ្រាបអាល់កុល bactérie ពណ៍ស្វាយ

c. ស្តើង មិនជ្រាបអាល់កុល ហើយ bactérie ពណ៍ស្វាយ

d. ក្រាស់ មិនអាចជ្រាបអាល់កុល ហើយ bactérie ពណ៍ក្រហម

60 / 60

Bactérie ដែលមិនអាចបង្កើត Spore មាន?

a. streptocoque

b. pneumocoque

c. coli bacille

d. All are corrects

e. Staphylocoque

Your score is

The average score is 84%

Any comments?

Any problems/errors or mistakes found while testing, please let us know for modification!

និស្សិតអាចប្រាប់មកកាន់ពួកយើងបានដើម្បីកែកំហុស ឬអំពីបញ្ហាដោយអចេតនាណាមួយដែលកើតមានកំឡុងពេលធ្វើតេស្ត