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

Cryptococcosis?

a. Is an infection caused by Cryptococcus neoformans

b. Is a localized inflammation around and under the nails

c. Is associated with dog lovers

d. Can cause cardiac abnormalities

2 / 60

Toxins or enzymes which are not produced by streptococcus pyogenes?

a. Phosphate

b. Streptokinase

c. Hyaluronides

d. Hemolysin

3 / 60

Fusobacterium Nucleatum 😕

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

b. Isolated from monomicrobial infections

c. Gram-positive, strictly anaerobic

d. Non capsulate diplococci

4 / 60

Main causative organism of chicken pox is?

a. Fox virus

b. Measles virus

c. Mumps virus

d. Varicella Zoster virus

5 / 60

An abortive infection is one in which: ?

a. Transplacental infection of the fetus occurs

b. The infected cells are killed

c. Progeny virus is not produced

d. Cell multiplication is stopped.

6 / 60

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

a. Porphyromonas

b. Legionella infection

c. Staphylococci

d. Group A streptococci.

7 / 60

Virus replicate by which of the following?

a. Reproduction.

b. Extracellular

c. Within a host cell

d. Cell division

8 / 60

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

a. Staphylococci

b. Streptococcus pneumonia

c. Treponema pallidum

d. Porphyromonas spp.

9 / 60

Which of the following statements on dental caries are true?

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

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

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

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

10 / 60

Chronic periodontitis is characterized by INEXACT:?

a. gingival recession

b. absence of pain in general.

c. systemic symptoms like fever

d. tooth mobility and migration

11 / 60

The main causative agent of Ludwig angina is:?

a. Fusobacteria.

b. Streptococcus pneumonia

c. Staphylococci

d. Treponema pallidum

12 / 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

13 / 60

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

a. facultative anaerobes predominate in gingivitis.

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. Gram-negative anaerobes predominate in chronic periodontitis

14 / 60

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

a. Hepatitis A

b. Hepatitis B immunoglobulin

c. Measles–mumps–rubella (MMR)

d. Hepatitis C.

15 / 60

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

a. Candida albicans

b. Streptococcus pyogenes

c. Hepatitis G

d. Influenza.

e. Ph. Heng Kanika

16 / 60

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

a. cytotoxic T cells.

b. cilia in the respiratory tract

c. lysozyme in saliva

d. unbroken skin

17 / 60

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

a. obligatory aerobic

b. obligatory anaerobic

c. facultatively anaerobic.

d. microaerobically

18 / 60

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

a. 5-7 years

b. Birth-6 months

c. 10-13 years.

d. 1-3 years

19 / 60

The primary cause of periodontal diseases is?

a. Restoration.

b. Malocclusion

c. Dental Plaque

d. Calculus

20 / 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. Sexual intercourse

c. Contact with contaminated food

d. Transfusion

21 / 60

Mouthwashes used for controlling oral malodor should contain?

a. Antibacterial agent

b. Sugar to make them more palatable to consumers

c. Xylitol.

d. Alcohol

22 / 60

Widely accepted theory of dental caries is 😕

a. Proteolytic theory

b. Acidogenic theory

c. Autoimmune theory.

d. Proteolytic chelation theory

23 / 60

Which of the following disease most commonly afflicts human?

a. Periodontal disease

b. Dentoalveolar abscess

c. Ludwig’s angina

d. Periodontal abscess.

24 / 60

Predisposing factors for acute necrotizing ulcerative gingivitis include INEXACT:?

a. heavy smoking

b. severe malnutrition

c. diabetes.

d. immunodeficiency

25 / 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

26 / 60

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

a. Streptococcus pyogenes

b. Streptococcus mutans

c. Streptococcus saprophyticus

d. Streptococcus pneumonia.

27 / 60

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

a. Chalkywhite lesion

b. Roughened and cavitation

c. Pseudomembrane (slough)

d. White-spot lesion.

28 / 60

How to manage dentoalveolar abscess?

a. Reducing cariogenic flora

b. Initial local debridement.

c. Removing source of infection and prescribing antibiotics

d. Probiotics replacement of cariogenic bacteria

29 / 60

Which of the following statements on dentoalveolar infections is INEXACTE?

a. Clinical presentation depends on virulence of causative microorganisms.

b. Prevalence and severity increase with age

c. Endogenous oral commensals, usually from apex of a necrotic tooth

d. Pus-producing infections associated with teeth and surrounding supporting structures

30 / 60

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

a. Loss of supporting tissues (noma).

b. Irregular alveolar bone loss around teeth

c. Inflamed, red, shiny and bleeding gingivae

d. Unpleasant metallic taste

31 / 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. Klebsiella pneumoniae

c. Mycobacterium tuberculosis

d. Pseudomonas aeruginosa

32 / 60

Strategy to control of rendox potential in oral biofilm:?

a. Stimulate base production

b. Inhibition of key microbial enzyme

c. Oxygenating agents

d. Fluoride

33 / 60

Bacteria usually cause Necrotizing Ulcerative Gingivitis?

a. Borrelia vincentii and Porphyromonas endodontalis

b. Fusiform bacillus and Capnocytophaga sputigena

c. Borrelia vincentii and Eikenella corrodens

d. Fusiform bacillus and Borrelia vincentii

34 / 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. Streptococcus pneumoniae

c. Mycobacterium tuberculosis

d. Klebsiella pneumoniae

35 / 60

Principal Rods Gram positive bacteria found in oral cavity:?

a. Actinomyces

b. Eikenella

c. Simonsiella

d. Prevotella

36 / 60

Oral opportunistic infection happens when:?

a. An organism that usually is pathogenic becomes normal flora

b. An organism that usually is pathogenic causes disease

c. An organism that usually is nonpathogenic causes disease

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

37 / 60

Bacteria usually cause Pericoronitis?

a. Fusiform bacillus , Provetella, Eikenella corrodens and Capnocytophaga sputigen

b. Fusiform bacillus, Eikenella corrodens, Alpha-hemolytic Streptococci and Capnocytophaga sputigena

c. Borrelia vincentii, Bacterioides, Provetella and Eikenella corrodens

d. Alpha-hemolytic Streptococci, Provetella, Bacterioides and Capnocytophaga

38 / 60

Analytical techniques for monitoring biofilms by “Direct detection” 😕

a. Inductively Coupled Plasma Mass Spectrometry (ICP-MS)

b. Microscopy techniques

c. High Pressure Liquid Chromatography (HPLC)

d. Gas Chromatography – Mass Spectrometry (GC-MS)

39 / 60

Strategy to control of nutrients in oral biofilm:?

a. Fluoride

b. Stimulate base production

c. Antimicrobial agents

d. Inhibition of key microbial enzyme

40 / 60

Microorganisms in oral tissue can cause 😕

a. Only local infection

b. Both, local and systemic infection

c. Systemic infection

d. Local infection

41 / 60

Strategy to control of biofilm pH in oral biofilm:?

a. Inhibition of key microbial enzyme

b. Fluoride

c. Generating nutrients

d. Antiflammatory agents

42 / 60

Which bacteria that is not presence in buccal mucosa?

a. Treponema palidum

b. Streptococcus mutans

c. Streptococcus anginosus

d. Streptococcus mitis

43 / 60

Major bacteria usually cause dental caries:?

a. Streptococcus pneumoniae, Lactobacilli, Actinomyces vicosus

b. Mutans Streptococci, Lactobacilli, Clostridium

c. Mutans Streptococci, Lactobacilli, Actinomyces vicosus

d. Mutans Streptococci, Staphylococcus aureus, Actinomyces vicosus

44 / 60

In dental caries, the protective factor is 😕

a. Frequent eating / drinking of fermentable carbohydrates

b. Poor oral hygiene

c. Acid producing bacteria

d. Antibacterials ( fluorides, Chlorhexidine, Xylitol)

45 / 60

បាក់តេរី Aérobies strictes គឺពពួកបាក់តេរីដែលត្រូវរស់ និង លូតលាស់បានដោយ?

a. ត្រូវការខ្យល់O2 និងមិនចាំបាច់ខ្យល់O2 ក៏បាន

b. មិនត្រូវការខ្យល់

c. ត្រូវការតែខ្យល់ O2

d. ត្រូវឧស្ម័នការបូនិក + ខ្យល់ O2

46 / 60

បាក់តេរីណាខ្លះដែល sensible និងកាំរស្មី ultra violet , កាំរស្មី X និងពន្លឺ?

a. ពពួក Entérobactérie

b. ពពួកបាក់តេរី gram(-)

c. ពពួកបាក់តេរី gram (+)

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

47 / 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

48 / 60

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

a. Aérobies-anaérobie facultative

b. Aérobies strictes , Micro-aérophiles, anaérobies stricte

c. Mésophile + Micro-aérophiles,anaérobies stricte

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

49 / 60

Bactérie ដែលមិនអាចបង្កើត Spore មាន?

a. pneumocoque

b. Staphylocoque

c. coli bacille

d. streptocoque

e. All are corrects

50 / 60

ពពួកបាក់តេរីណាដែលអាចរស់នៅ បានដោយខ្យល់ O2 រី អត់សោះក៏បាន?

a. Entérobactérie

b. Eschérichia-coli

c. gonocoque

d. Salmonella

51 / 60

បរិមាណចំណីអាហារសំរាប់ទ្រទ្រង់ជីវិតបាក់តេរីហៅថា?

a. Ration totale

b. ration de crosissance

c. ration de crosissance and Ration d’entretien

d. Ration d’entretien

52 / 60

បាក់តេរី Doderlein អាចរស់នៅក្នុង milieu?

a. milieu alcalin

b. milieu acide + base

c. milieu base

d. milieu acide

53 / 60

Micro-aérophile គឺជាពពួកបាក់តេរីដែលត្រូវការ?

a. មិនត្រូវខ្យល់ O2

b. មានខ្យល់ O2 ច្រើន

c. មានខ្យល់ O2 តិច

d. ខ្យល់ O2 តិចក៏បាន ច្រើើនក៏បាន

54 / 60

មុខងាររបស់ menbrame cytoplasmique ?

a. សារធាតុខ្លះត្រូវ menbrame អនុញ្ញាតិអោយចេញចូលដូចជាទឹក។

b. ជារបាំងមួយសំរាប់អោយសារធាតុជ្រាបចេញ និង ចូលតាមការអនុញ្ញាតរបស់វា

c. សារធាតុខ្លះត្រូវ menbrame បង្ខំចេញទៅវិញ

d. All are corrects

e. សារធាតុខ្លះទៀតអាចជ្រៀបចូលបានដូចស្ករ acide

55 / 60

Paroi នៃបាក់តេរី Gram negatif ផ្សំឡើងដោយ?

a. céramique

b. Mucopeptide

c. uréine+gelatin

d. gelatin

56 / 60

សេចក្តីត្រូវការផ្នែករូបធាតុក្នុងតំរូវការតិចមាន?

a. Ca , Mg , K, S , P , Fe

b. Ca . Mg . K

c. C. H . O2 .Z

d. S . P . Fe

57 / 60

virusមានរូបរាងមូលដ្ឋានបីបែប?

a. Helical, Icosahedral, Complex

b. Helical, Icosahedral ,Spirillum (spirals )

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

d. Complex Helical,Bacillus(rods)

58 / 60

ការជ្រាបចូលនៃសារធាតុនិង ចំណីអាហាររបស់បាក់តេរី កាលណាវាជា forme simple អាចជ្រាប ចូលដោយត្រង់ៗដូចជាសារធាតុ?

a. ATP , glucose

b. Acide amine , ជាតិស្ករ

c. Acetyl-CoA

d. glucose, ATP ,Acide amine

59 / 60

មធ្យោបាយសិក្សា bacteria , virus and fungi 😕

a. Transmission Electron Microscope

b. All are corrects

c. Electron Microscope

d. Optical microscope

60 / 60

សេចក្តីត្រូវការ (Les besoins nutritifs ) របស់បាក់តេរីផ្នែករូបធាតុក្នុងបរិមាណច្រើនមាន?

a. Ca . Mg. K

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

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

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

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The average score is 84%

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និស្សិតអាចប្រាប់មកកាន់ពួកយើងបានដើម្បីកែកំហុស ឬអំពីបញ្ហាដោយអចេតនាណាមួយដែលកើតមានកំឡុងពេលធ្វើតេស្ត