Oral Microbiology Preparation (Ph. Heng Kanika)

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1) Fusobacterium Nucleatum 😕

a. Cause scarlet fever

b. Black pigmented Gram-negative microorganism

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

d. Implicated in Dental caries

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

a. It is a eukaryote

b. Short rods, but often pleomorphic

c. It causes chronic granulomatous infections

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

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

a. Pericoronitis

b. Lateral periodontal abcess

c. Herpetic stomatitis

d. Acute necrotizing ulcerative gingivitis

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

a. Hyaluronic acid

b. Adhesins

c. Proteases, haemolysin and collagenase

d. Cytotoxins

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5) 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. Staphylococcus

b. Bacteroides

c. Lactobacillus

d. Streptococcus

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6) Herpagina is usually cause by?

a. Group A coxsackieviruses

b. Hepatitis A virus

c. Group B coxackieviruses

d. Cytomegalovirus

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

a. Streptokinase

b. Hemolysin

c. Hyaluronides

d. Phosphate

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9) Which microorganism implicated in pit and fissure caries?

a. Actinimyces viscosus

b. Streptococcus mutans

c. Staphylococcus aureus

d. Streptococcus mitis

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10) Certain strains of Streptococcus mutans?

a. Extracellular glucan production.

b. Are cause of infective meningitides

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

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

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11) 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. Candida albicans

b. Herpes simplex

c. Staphylococcus aureus

d. Actinomyces

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

a. Transferred by insects bite.

b. Transferred by hands or objects

c. Required by transient flora

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

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13) Fusobacterium Nucleatum 😕

a. Isolated from monomicrobial infections

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

c. Non capsulate diplococci

d. Gram-positive, strictly anaerobic

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14) During AIDS, HIV infects?

a. B Lymphocytes

b. CD4 lymphocytes

c. CD2 lymphocytes

d. CD3 lymphocytes

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

a. Black pigmented Gram-positive

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

c. Microaerophilic

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

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

a. Staphylococcus aureus

b. Actinomyces viscosus

c. Porphyromonas gingivalis

d. Fusobacterium Nucleatum

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17) Main causative organism of chicken pox is?

a. Fox virus

b. Measles virus

c. Mumps virus

d. Varicella Zoster virus

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

a. Poliomyelitis

b. Mumps

c. Rubella

d. A. Measles

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

a. Staphylococcus aureus

b. Streptococcus sorbinus

c. Staphylococcus epidermidis

d. Escherichia coli

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20) Causative agent of scarlet fever?

a. Streptococcus viridans

b. Staphylococcus aureus

c. None of these

d. Streptococcus pyogens

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

a. Fusobacterium nucleatum and Streptococcus mutans

b. Staphylococcus aureus and Streptococcus mutans

c. Fusobacterium nucleatum and Spirochetes

d. Fusobacterium nucleatum and Actinomyces viscosus

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22) 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

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23) Epstein-Barr Virus (EBV)?

a. Group A infect: skin and mucous membranes

b. Achieves latency in sensory ganglia

c. Betaherpesvirus subfamily of herpesviruses

d. Cause of infectious mononucleosis

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24) AIDS virus is ?

a. DNA virus

b. RNA virus

c. Enterovirus

d. Retro virus

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25) Mumps virus is belonging to?

a. Orthomyxoviridae

b. Paramyxoviridae

c. Retroviriae

d. None of these

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

a. hemolysine

b. Hyaluronidase

c. Streptodornas

d. leukotoxin A

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27) 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. Epstein-Barr

b. Herpes simplex

c. Paramyxovirus

d. Herpes zoster

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28) Primary herpesvirus infections may cause:?

a. Meningititis

b. Herpes labialis

c. Herpes zoster

d. Herpetic gingivostomatitis

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

a. cigar-shaped bacilli

b. Aggressive forms of periodontal disease in adolescents

c. Non-capsulate diplococcic

d. Aggressive forms of dental caries in adolescents

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30) Cryptococcosis?

a. Can cause cardiac abnormalities

b. Is associated with dog lovers

c. Is an infection caused by Cryptococcus neoformans

d. Is a localized inflammation around and under the nails

Your score is

The average score is 86%

Any comments?

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និស្សិតអាចប្រាប់មកកាន់ពួកយើងបានដើម្បីកែកំហុស ឬអំពីបញ្ហាដោយអចេតនាណាមួយដែលកើតមានកំឡុងពេលធ្វើតេស្ត