Oral Microbiology Preparation (Ph. Heng Kanika)

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135

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1) Which microorganism implicated in pit and fissure caries?

a. Streptococcus mutans

b. Actinimyces viscosus

c. Staphylococcus aureus

d. Streptococcus mitis

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2) Cryptococcosis?

a. Can cause cardiac abnormalities

b. Is a localized inflammation around and under the nails

c. Is an infection caused by Cryptococcus neoformans

d. Is associated with dog lovers

3 / 30

3) 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.

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

a. Rubella

b. Mumps

c. Poliomyelitis

d. A. Measles

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5) Herpagina is usually cause by?

a. Cytomegalovirus

b. Hepatitis A virus

c. Group B coxackieviruses

d. Group A coxsackieviruses

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6) Acute necrotizing ulcerative gingivitis (ANUG) or trench mouth is caused by a mixed bacterial infection such as?

a. Staphylococcus aureus and Streptococcus mutans

b. Fusobacterium nucleatum and Actinomyces viscosus

c. Fusobacterium nucleatum and Streptococcus mutans

d. Fusobacterium nucleatum and Spirochetes

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7) Which of the following statement on Actinobacillus actinomycetemcomitans are true?

a. Aggressive forms of dental caries in adolescents

b. cigar-shaped bacilli

c. Non-capsulate diplococcic

d. Aggressive forms of periodontal disease in adolescents

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

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

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

c. Microaerophilic

d. Black pigmented Gram-positive

9 / 30

9) Porphyromonas gingivalis:?

a. Are isolated from many extra oral sites

b. Are non-capsulated

c. Are aggressive periodontal pathogens

d. Are Gram-positive pleomorphic rods

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10) Several infections occur in the oral cavity that are of relevance to the dental team. Which of the following infections does virus cause?

a. Lateral periodontal abcess

b. Pericoronitis

c. Herpetic stomatitis

d. Acute necrotizing ulcerative gingivitis

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11) Fusobacterium Nucleatum 😕

a. Implicated in Dental caries

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

c. Black pigmented Gram-negative microorganism

d. Cause scarlet fever

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12) The virulence of Porphyromonas gingivalis is partly due to?

a. Adhesins

b. Cytotoxins

c. Proteases, haemolysin and collagenase

d. Hyaluronic acid

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13) Which of the following statements on Actinomycetes are not true?

a. It is a eukaryote

b. It causes chronic granulomatous infections

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

d. Short rods, but often pleomorphic

14 / 30

14) 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. Lactobacillus

b. Staphylococcus

c. Bacteroides

d. Streptococcus

15 / 30

15) There are some main routes of infection in oral cavity, which one is inexact?

a. Transferred through the air on dust particles or water droplets

b. Required by transient flora

c. Transferred by insects bite.

d. Transferred by hands or objects

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16) 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 simplex

d. Herpes zoster

17 / 30

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

a. hemolysine

b. Streptodornas

c. Hyaluronidase

d. leukotoxin A

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18) 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. Actinomyces

b. Candida albicans

c. Herpes simplex

d. Staphylococcus aureus

19 / 30

19) Main causative organism of chicken pox is?

a. Fox virus

b. Varicella Zoster virus

c. Mumps virus

d. Measles virus

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20) The organisms most commonly associated with root caries are ?

a. Staphylococcus aureus

b. Fusobacterium Nucleatum

c. Actinomyces viscosus

d. Porphyromonas gingivalis

21 / 30

21) AIDS virus is ?

a. DNA virus

b. RNA virus

c. Enterovirus

d. Retro virus

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22) Toxins or enzymes which are not produced by streptococcus pyogenes?

a. Hyaluronides

b. Hemolysin

c. Streptokinase

d. Phosphate

23 / 30

23) Primary herpesvirus infections may cause:?

a. Herpes zoster

b. Herpetic gingivostomatitis

c. Meningititis

d. Herpes labialis

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24) Fusobacterium Nucleatum 😕

a. Gram-positive, strictly anaerobic

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

c. Isolated from monomicrobial infections

d. Non capsulate diplococci

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

a. Streptococcus sorbinus

b. Escherichia coli

c. Staphylococcus aureus

d. Staphylococcus epidermidis

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26) Coxsakievirus have been found to replicate in the?

a. Submucosal lymph tissue

b. Small bowel

c. Reticuloendothelial system

d. Sensory nerve

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27) Mumps virus is belonging to?

a. Orthomyxoviridae

b. Paramyxoviridae

c. None of these

d. Retroviriae

28 / 30

28) During AIDS, HIV infects?

a. CD3 lymphocytes

b. CD2 lymphocytes

c. B Lymphocytes

d. CD4 lymphocytes

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29) Causative agent of scarlet fever?

a. Streptococcus pyogens

b. None of these

c. Staphylococcus aureus

d. Streptococcus viridans

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30) Epstein-Barr Virus (EBV)?

a. Achieves latency in sensory ganglia

b. Betaherpesvirus subfamily of herpesviruses

c. Group A infect: skin and mucous membranes

d. Cause of infectious mononucleosis

Your score is

The average score is 89%

Any comments?

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និស្សិតអាចប្រាប់មកកាន់ពួកយើងបានដើម្បីកែកំហុស ឬអំពីបញ្ហាដោយអចេតនាណាមួយដែលកើតមានកំឡុងពេលធ្វើតេស្ត