Oral Microbiology Test

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1 / 60

Specificity of Anaerobic bacteria, except:?

a. Black pigmentation on culture

b. Incubation culture in 1-2 days

c. Grow on anaerobic media culture

d. Foul odor when opening anaerobic jar or bag

2 / 60

Major bacteria cause periodontitis 😕

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

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

c. Fusobacterium nucleatum, Petostreptococcus micros, Streptococci, Pneumococcus

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

3 / 60

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

a. Phase 3

b. Phase 2

c. Phase 1

d. Phase 4

4 / 60

Principal Cocci Gram negative bacteria found in oral cavity:?

a. Gemella

b. Streptococcus

c. Veillonella

d. Enterococcus

5 / 60

Major bacteria cause aggressive periodontitis?

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

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

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

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

6 / 60

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

a. Administration of antibiotics

b. Changes in salivary flow

c. Changes in exposure to antiseptic

d. Changes in the immune system

7 / 60

Infections of the mucosa are more usually associated with transient oral bacteria, which one is incorrect?

a. Helicobacter

b. Enterococcus

c. Staphylococcus

d. Pseudomonas

8 / 60

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

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

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

c. Streptococcus mutans

d. Streptococcus mitis

9 / 60

Bacteria usually cause Pericoronitis?

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

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

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

d. Borrelia vincentii, Bacterioides, Provetella and Eikenella corrodens

10 / 60

Major bacteria usually cause dental caries:?

a. Mutans Streptococci, Lactobacilli, Actinomyces vicosus

b. Streptococcus pneumoniae, Lactobacilli, Actinomyces vicosus

c. Mutans Streptococci, Lactobacilli, Clostridium

d. Mutans Streptococci, Staphylococcus aureus, Actinomyces vicosus

11 / 60

Principal Rods Gram negative bacteria found in oral cavity:?

a. Lactobacillus

b. Corynebacterium

c. Porphyromonas

d. Eubacterium

12 / 60

Microorganisms in oral tissue can cause 😕

a. Systemic infection

b. Local infection

c. Both, local and systemic infection

d. Only local infection

13 / 60

ពពួកបាក់តេរីដែលគ្មាន peptide-glycane តែមាន enveloppe externe និងភ្នាសcytoplasmique ហៅថា ?

a. Mésophile

b. Protoplastes

c. Sphéroplaste

d. Mycoplasme

14 / 60

បាក់តេរីដែលធ្វើអោយពុលដល់ចំណីអាហារកំប៉ុងឈ្មោះអ្វី ?

a. Pneumcoque

b. Clostridium

c. Staphylocoque

d. Streptocoque

15 / 60

បរិមាណចំណីអាហារសំរាប់ទ្រទ្រង់ជីវិតបាក់តេរីហៅថា?

a. ration de crosissance

b. Ration totale

c. Ration d’entretien

d. ration de crosissance and Ration d’entretien

16 / 60

virusមានរូបរាងមូលដ្ឋានបីបែប?

a. Complex Helical,Bacillus(rods)

b. Helical, Icosahedral, Complex

c. Helical, Icosahedral ,Spirillum (spirals )

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

17 / 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

18 / 60

Paroi bacterie gram négatif មានលក្ខណៈ?

a. ស្តើង អាល់កុលមិនអាចជ្រាបចូលបាន

b. ស្តើង អាល់កុលអាចជ្រាប ហើយ bactérie ពណ៍ក្រហម

c. ក្រាស់ អាល់កុលអាចជ្រាប ហើយ bactérie ពណ៍ខៀវ

d. ស្តើង អាល់កុលអាចជ្រាបហើយ bactérie ពណ៍ខៀវ

19 / 60

ការជ្រាបចូលនៃសារធាតុនិង ចំណីអាហាររបស់បាក់តេរី កាលណាវាជា forme simple អាចជ្រាប ចូលដោយត្រង់ៗដូចជាសារធាតុ?

a. Acide amine , ជាតិស្ករ

b. glucose, ATP ,Acide amine

c. ATP , glucose

d. Acetyl-CoA

20 / 60

បាក់តេរីប្រភេទ themophile អាចរស់នៅក្នុងសីតុណ្ហភាពជាមធ្យមលើសពី?

a. 20 ˚C

b. 30 ˚C

c. 37 ˚C

d. 40 ˚C

21 / 60

សេចក្តីត្រូវការផ្នែករូបធាតុក្នុងតំរូវការតិចមាន?

a. Ca . Mg . K

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

c. S . P . Fe

d. C. H . O2 .Z

22 / 60

virusមានទំហំតូចជាង បាក់តេរីចំនួន ?

a. ៨០០ ដង

b. ៩០០ ដង

c. ១០០០ ដង

d. ២០០០ ដង

23 / 60

បាក់តេរីប្រភេទ Mésophile អាចរស់នៅក្នុងសីតុណ្ហភាព?

a. 10-15 ˚C

b. 40-50 ˚C

c. 20-40 ˚C

d. 10-20 ˚C

24 / 60

ពពួកបាក់តេរីណាដែលអាចរស់នៅ បានដោយខ្យល់ O2 រី អត់សោះក៏បាន?

a. Eschérichia-coli

b. Entérobactérie

c. gonocoque

d. Salmonella

25 / 60

virus មានចរិកលក្ខណៈ នៃភាវរស់នៅរបស់វាទាំងអស់ចំនួន?

a. ប្រាំ

b. ប្រាំមួយ

c. បី

d. បួន

26 / 60

ដើម្បីរស់ បាក់តេរីការចំណីអាហារប៉ុន្មានភាគរយ នៃ Ration totale សំរាប់ការរស់នៅក្នុងធម្មជាតិ?

a. 1/400

b. 1/600

c. 1/500

d. 1/300

27 / 60

Anaérobies strictes គឺពពួកបាក់តេរីដែលអាចរស់ និងលូតលាស់បានទាល់តែ?

a. មានខ្យល់ O2 ល្មម

b. គ្មានខ្យល់ O2 សោះ

c. មានខ្យល់ O2 តិច

d. មានខ្យល់ O2ច្រើន

28 / 60

A patient attends the surgery with bilateral swelling of the parotid salivary glands. Which condition are they suffering from?

a. A. Measles

b. Poliomyelitis

c. Rubella

d. Mumps

29 / 60

Various viral infections are of relevance to the dental team, including those that cause disease affecting the head neck region. Which one of the following viruses causes cold sores?

a. Paramyxovirus

b. Epstein-Barr

c. Herpes zoster

d. Herpes simplex

30 / 60

Fusobacterium Nucleatum 😕

a. Isolated from monomicrobial infections

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

c. Gram-positive, strictly anaerobic

d. Non capsulate diplococci

31 / 60

Porphyromonas gingivalis:?

a. Are isolated from many extra oral sites

b. Are aggressive periodontal pathogens

c. Are Gram-positive pleomorphic rods

d. Are non-capsulated

32 / 60

Epstein-Barr Virus (EBV)?

a. Achieves latency in sensory ganglia

b. Group A infect: skin and mucous membranes

c. Cause of infectious mononucleosis

d. Betaherpesvirus subfamily of herpesviruses

33 / 60

Main causative organism of chicken pox is?

a. Mumps virus

b. Fox virus

c. Measles virus

d. Varicella Zoster virus

34 / 60

Which of the following statements on Actinomycetes are not true?

a. It infrequently causes actinomycoses of the jaws after tooth extractions

b. Short rods, but often pleomorphic

c. It is a eukaryote

d. It causes chronic granulomatous infections

35 / 60

The virulence of Porphyromonas gingivalis is partly due to?

a. Adhesins

b. Cytotoxins

c. Proteases, haemolysin and collagenase

d. Hyaluronic acid

36 / 60

What are the predominant plaque bacteria in periodontitis?

a. Facultative anaerobia cocci (-)

b. Anaerobic rods (+)

c. Anaerobic rods (-).

d. Facultative anaerobia cocci (+)

37 / 60

Bacterial pathogens attach most often by all except which of the following mechanisms?

a. Spikes

b. Fimbriae (pili)

c. Glycocalyx.

d. Adhesins

38 / 60

Following can be used for cultivation of viruses EXCEPT:?

a. Cell cultures

b. Primary cell

c. Diploid cell line

d. Blood agar.

39 / 60

Which of the following statements on aggressive periodontitis is EXACTE?

a. Most prevalent disease globally

b. Initiation is onset of puberty

c. Prevalence and severity decrease with age

d. 95% of all periodontal diseases.

40 / 60

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

a. Osteomylitis.

b. Dental caries

c. Periodontitis

d. Gingivitis

41 / 60

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

a. Aggregatibacter actinomycetemcomitans

b. Streptococcus sanguinis

c. Porphyromonas gingivalis

d. Prevotella intermedia.

42 / 60

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

a. Electrical impedance

b. Probing

c. Organoleptic assessment.

d. Laser fluorescence

43 / 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

44 / 60

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

a. latent

b. oncogenic

c. resistant.

d. cytopathic

45 / 60

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

a. 1-3 years

b. 10-13 years.

c. Birth-6 months

d. 5-7 years

46 / 60

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

a. Ph. Heng Kanika

b. Streptococcus pyogenes

c. Influenza.

d. Candida albicans

e. Hepatitis G

47 / 60

Which of the following statements on dental caries are true?

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

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. recurrent caries is commonly associated with an existing restoration.

48 / 60

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

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

b. facultative anaerobes predominate in gingivitis.

c. Gram-negative anaerobes predominate in chronic periodontitis

d. Gram-positive cocci predominate in healthy gingival crevice

49 / 60

Lysozyme is present in?

a. Urine

b. Cerebro spinal fluid (CSF)

c. Saliva.

d. Sweat

50 / 60

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

a. Death due to asphyxiation

b. pread of infection to masticator

c. Airway obstruction due to edema of glottis

d. Respiratory tract infections.

51 / 60

Initiation of dental caries depends upon:?

a. Localisation of acid over tooth surface.

b. viscosity of saliva

c. formation of large amount of acid

d. availability of carbohydrate food

52 / 60

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

a. facultatively anaerobic.

b. microaerobically

c. obligatory anaerobic

d. obligatory aerobic

53 / 60

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

a. Wearing a single face mask for 3 h

b. Wearing headgear for all operational procedures

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

d. Wearing gloves after removal of all hand jewellery.

54 / 60

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

a. Dextran

b. Sucrose

c. Xylitol.

d. Polysaccharide

55 / 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:

56 / 60

The bacteria detected in localized aggressive periodontitis are:?

a. Treponema denticola and fusobacterium nucleatum.

b. Fusiformis and Tanerella forsythus.

c. Borrelia vincenti and medium size spirochetes.

d. A. actinomycetemcomitans, Capnocytophaga spp. and Porphyromonas gingivalis.

57 / 60

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

a. Possibly systemic diseases

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

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

d. Commonly associated with poor and neglected oral hygiene

58 / 60

Which of the following statements on chronic periodontitis is INEXACTE?

a. 95% of all periodontal diseases.

b. Most prevalent disease globally

c. Morbidity 70–80%

d. Prevalence and severity decrease with age

59 / 60

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

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

b. substituting cariogenic artificial sweeteners

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

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

60 / 60

Dentoalveolar abscess is treated by:?

a. Gingivectomy

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

c. Gingivoplasty

d. Periodontal flap procedure

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និស្សិតអាចប្រាប់មកកាន់ពួកយើងបានដើម្បីកែកំហុស ឬអំពីបញ្ហាដោយអចេតនាណាមួយដែលកើតមានកំឡុងពេលធ្វើតេស្ត