Oral Microbiology Preparation (Ph. Heng Kanika)

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1) Primary herpesvirus infections may cause:?

a. Herpes labialis

b. Herpes zoster

c. Herpetic gingivostomatitis

d. Meningititis

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

a. Required by transient flora

b. Transferred by hands or objects

c. Transferred by insects bite.

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

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3) Mumps virus is belonging to?

a. None of these

b. Orthomyxoviridae

c. Paramyxoviridae

d. Retroviriae

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4) Epstein-Barr Virus (EBV)?

a. Group A infect: skin and mucous membranes

b. Betaherpesvirus subfamily of herpesviruses

c. Achieves latency in sensory ganglia

d. Cause of infectious mononucleosis

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

a. Aggressive forms of periodontal disease in adolescents

b. cigar-shaped bacilli

c. Non-capsulate diplococcic

d. Aggressive forms of dental caries in adolescents

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6) Which microorganism implicated in pit and fissure caries?

a. Actinimyces viscosus

b. Streptococcus mitis

c. Staphylococcus aureus

d. Streptococcus mutans

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7) Herpagina is usually cause by?

a. Cytomegalovirus

b. Group B coxackieviruses

c. Group A coxsackieviruses

d. Hepatitis A virus

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8) Fusobacterium Nucleatum 😕

a. Cause scarlet fever

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

c. Black pigmented Gram-negative microorganism

d. Implicated in Dental caries

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9) 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. Herpes simplex

b. Staphylococcus aureus

c. Candida albicans

d. Actinomyces

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

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

b. Microaerophilic

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

d. Black pigmented Gram-positive

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11) Certain strains of Streptococcus mutans?

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

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

c. Extracellular glucan production.

d. Are cause of infective meningitides

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12) Main causative organism of chicken pox is?

a. Varicella Zoster virus

b. Mumps virus

c. Fox virus

d. Measles virus

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13) Cryptococcosis?

a. Is associated with dog lovers

b. Can cause cardiac abnormalities

c. Is an infection caused by Cryptococcus neoformans

d. Is a localized inflammation around and under the nails

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

a. Hyaluronic acid

b. Cytotoxins

c. Adhesins

d. Proteases, haemolysin and collagenase

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

a. Acute necrotizing ulcerative gingivitis

b. Pericoronitis

c. Lateral periodontal abcess

d. Herpetic stomatitis

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

a. Rubella

b. A. Measles

c. Poliomyelitis

d. Mumps

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17) Porphyromonas gingivalis:?

a. Are non-capsulated

b. Are aggressive periodontal pathogens

c. Are isolated from many extra oral sites

d. Are Gram-positive pleomorphic rods

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18) 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 Spirochetes

d. Fusobacterium nucleatum and Streptococcus mutans

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19) 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. Herpes zoster

b. Paramyxovirus

c. Herpes simplex

d. Epstein-Barr

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20) During AIDS, HIV infects?

a. CD2 lymphocytes

b. CD4 lymphocytes

c. CD3 lymphocytes

d. B Lymphocytes

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21) Coxsakievirus have been found to replicate in the?

a. Small bowel

b. Sensory nerve

c. Submucosal lymph tissue

d. Reticuloendothelial system

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22) AIDS virus is ?

a. RNA virus

b. DNA virus

c. Enterovirus

d. Retro virus

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

a. leukotoxin A

b. hemolysine

c. Hyaluronidase

d. Streptodornas

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24) Causative agent of scarlet fever?

a. Staphylococcus aureus

b. Streptococcus pyogens

c. Streptococcus viridans

d. None of these

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

a. Phosphate

b. Hyaluronides

c. Streptokinase

d. Hemolysin

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26) 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. Staphylococcus

c. Lactobacillus

d. Bacteroides

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

a. It causes chronic granulomatous infections

b. It is a eukaryote

c. Short rods, but often pleomorphic

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

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

a. Staphylococcus aureus

b. Actinomyces viscosus

c. Fusobacterium Nucleatum

d. Porphyromonas gingivalis

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

a. Streptococcus sorbinus

b. Staphylococcus aureus

c. Escherichia coli

d. Staphylococcus epidermidis

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30) Fusobacterium Nucleatum 😕

a. Gram-positive, strictly anaerobic

b. Isolated from monomicrobial infections

c. Non capsulate diplococci

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

Your score is

The average score is 90%

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