Oral Microbiology Preparation (Ph. Heng Kanika)

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1) Coxsakievirus have been found to replicate in the?

a. Sensory nerve

b. Submucosal lymph tissue

c. Small bowel

d. Reticuloendothelial system

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

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

b. It causes chronic granulomatous infections

c. Short rods, but often pleomorphic

d. It is a eukaryote

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

a. Phosphate

b. Hemolysin

c. Streptokinase

d. Hyaluronides

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4) During AIDS, HIV infects?

a. B Lymphocytes

b. CD2 lymphocytes

c. CD3 lymphocytes

d. CD4 lymphocytes

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5) 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

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6) 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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7) Fusobacterium Nucleatum 😕

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

b. Cause scarlet fever

c. Black pigmented Gram-negative microorganism

d. Implicated in Dental caries

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

a. Staphylococcus aureus

b. Streptococcus sorbinus

c. Escherichia coli

d. Staphylococcus epidermidis

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10) Herpagina is usually cause by?

a. Group B coxackieviruses

b. Group A coxsackieviruses

c. Cytomegalovirus

d. Hepatitis A virus

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11) 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. Staphylococcus

c. Lactobacillus

d. Streptococcus

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

a. Staphylococcus aureus

b. Porphyromonas gingivalis

c. Fusobacterium Nucleatum

d. Actinomyces viscosus

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13) Mumps virus is belonging to?

a. Paramyxoviridae

b. Retroviriae

c. Orthomyxoviridae

d. None of these

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14) Primary herpesvirus infections may cause:?

a. Meningititis

b. Herpes labialis

c. Herpes zoster

d. Herpetic gingivostomatitis

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

a. Microaerophilic

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

c. Black pigmented Gram-positive

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

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16) AIDS virus is ?

a. DNA virus

b. RNA virus

c. Retro virus

d. Enterovirus

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

a. hemolysine

b. leukotoxin A

c. Streptodornas

d. Hyaluronidase

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18) Epstein-Barr Virus (EBV)?

a. Achieves latency in sensory ganglia

b. Cause of infectious mononucleosis

c. Group A infect: skin and mucous membranes

d. Betaherpesvirus subfamily of herpesviruses

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19) Main causative organism of chicken pox is?

a. Mumps virus

b. Varicella Zoster virus

c. Measles virus

d. Fox virus

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20) Causative agent of scarlet fever?

a. Streptococcus viridans

b. Staphylococcus aureus

c. Streptococcus pyogens

d. None of these

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

a. Mumps

b. Rubella

c. Poliomyelitis

d. A. Measles

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22) Fusobacterium Nucleatum 😕

a. Non capsulate diplococci

b. Gram-positive, strictly anaerobic

c. Isolated from monomicrobial infections

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

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

a. Transferred by hands or objects

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

c. Transferred by insects bite.

d. Required by transient flora

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24) 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. Acute necrotizing ulcerative gingivitis

c. Pericoronitis

d. Herpetic stomatitis

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25) Which microorganism implicated in pit and fissure caries?

a. Actinimyces viscosus

b. Streptococcus mitis

c. Staphylococcus aureus

d. Streptococcus mutans

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26) 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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27) Certain strains of Streptococcus mutans?

a. Extracellular glucan production.

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

c. Are cause of infective meningitides

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

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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 zoster

b. Epstein-Barr

c. Paramyxovirus

d. Herpes simplex

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29) Porphyromonas gingivalis:?

a. Are Gram-positive pleomorphic rods

b. Are aggressive periodontal pathogens

c. Are isolated from many extra oral sites

d. Are non-capsulated

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

a. Hyaluronic acid

b. Proteases, haemolysin and collagenase

c. Cytotoxins

d. Adhesins

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