Oral Microbiology Preparation (Ph. Heng Kanika)

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1) Coxsakievirus have been found to replicate in the?

a. Sensory nerve

b. Small bowel

c. Submucosal lymph tissue

d. Reticuloendothelial system

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2) 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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3) Which microorganism implicated in pit and fissure caries?

a. Actinimyces viscosus

b. Staphylococcus aureus

c. Streptococcus mutans

d. Streptococcus mitis

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4) 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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5) 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. Actinomyces

d. Candida albicans

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6) Mumps virus is belonging to?

a. Paramyxoviridae

b. Orthomyxoviridae

c. Retroviriae

d. None of these

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7) Fusobacterium Nucleatum 😕

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

b. Implicated in Dental caries

c. Black pigmented Gram-negative microorganism

d. Cause scarlet fever

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8) 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. Herpetic stomatitis

c. Pericoronitis

d. Lateral periodontal abcess

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9) Causative agent of scarlet fever?

a. Staphylococcus aureus

b. None of these

c. Streptococcus pyogens

d. Streptococcus viridans

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

a. Rubella

b. Poliomyelitis

c. Mumps

d. A. Measles

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

a. Cytotoxins

b. Adhesins

c. Hyaluronic acid

d. Proteases, haemolysin and collagenase

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12) During AIDS, HIV infects?

a. B Lymphocytes

b. CD2 lymphocytes

c. CD4 lymphocytes

d. CD3 lymphocytes

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13) Porphyromonas gingivalis:?

a. Are non-capsulated

b. Are Gram-positive pleomorphic rods

c. Are aggressive periodontal pathogens

d. Are isolated from many extra oral sites

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14) Cryptococcosis?

a. Can cause cardiac abnormalities

b. Is an infection caused by Cryptococcus neoformans

c. Is associated with dog lovers

d. Is a localized inflammation around and under the nails

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15) Herpagina is usually cause by?

a. Group B coxackieviruses

b. Hepatitis A virus

c. Group A coxsackieviruses

d. Cytomegalovirus

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

a. Aggressive forms of periodontal disease in adolescents

b. Aggressive forms of dental caries in adolescents

c. cigar-shaped bacilli

d. Non-capsulate diplococcic

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

a. Streptokinase

b. Hyaluronides

c. Phosphate

d. Hemolysin

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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 Spirochetes

c. Fusobacterium nucleatum and Actinomyces viscosus

d. Fusobacterium nucleatum and Streptococcus mutans

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19) 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. Bacteroides

b. Streptococcus

c. Lactobacillus

d. Staphylococcus

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20) Certain strains of Streptococcus mutans?

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

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

c. Extracellular glucan production.

d. Are cause of infective meningitides

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21) Main causative organism of chicken pox is?

a. Mumps virus

b. Measles virus

c. Varicella Zoster virus

d. Fox virus

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

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

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

c. Microaerophilic

d. Black pigmented Gram-positive

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23) AIDS virus is ?

a. DNA virus

b. Enterovirus

c. RNA virus

d. Retro virus

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24) 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

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

a. It is a eukaryote

b. Short rods, but often pleomorphic

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

d. It causes chronic granulomatous infections

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27) 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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28) 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 simplex

b. Epstein-Barr

c. Herpes zoster

d. Paramyxovirus

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29) Epstein-Barr Virus (EBV)?

a. Betaherpesvirus subfamily of herpesviruses

b. Achieves latency in sensory ganglia

c. Cause of infectious mononucleosis

d. Group A infect: skin and mucous membranes

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30) Primary herpesvirus infections may cause:?

a. Meningititis

b. Herpes labialis

c. Herpetic gingivostomatitis

d. Herpes zoster

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