Oral Microbiology Preparation (Ph. Heng Kanika)

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1) 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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2) 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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3) During AIDS, HIV infects?

a. CD3 lymphocytes

b. B Lymphocytes

c. CD4 lymphocytes

d. CD2 lymphocytes

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4) 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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5) Cryptococcosis?

a. Is an infection caused by Cryptococcus neoformans

b. Is a localized inflammation around and under the nails

c. Is associated with dog lovers

d. Can cause cardiac abnormalities

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6) Fusobacterium Nucleatum 😕

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

b. Black pigmented Gram-negative microorganism

c. Implicated in Dental caries

d. Cause scarlet fever

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

a. Staphylococcus aureus

b. Staphylococcus epidermidis

c. Escherichia coli

d. Streptococcus sorbinus

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

a. cigar-shaped bacilli

b. Non-capsulate diplococcic

c. Aggressive forms of periodontal disease in adolescents

d. Aggressive forms of dental caries in adolescents

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9) Primary herpesvirus infections may cause:?

a. Meningititis

b. Herpes zoster

c. Herpetic gingivostomatitis

d. Herpes labialis

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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. A. Measles

b. Poliomyelitis

c. Rubella

d. Mumps

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

a. Staphylococcus aureus

b. Fusobacterium Nucleatum

c. Porphyromonas gingivalis

d. Actinomyces viscosus

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

a. Transferred by hands or objects

b. Required by transient flora

c. Transferred by insects bite.

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

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13) 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. Herpetic stomatitis

d. Pericoronitis

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14) Causative agent of scarlet fever?

a. Streptococcus pyogens

b. None of these

c. Staphylococcus aureus

d. Streptococcus viridans

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15) Which microorganism implicated in pit and fissure caries?

a. Actinimyces viscosus

b. Streptococcus mutans

c. Streptococcus mitis

d. Staphylococcus aureus

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16) AIDS virus is ?

a. DNA virus

b. RNA virus

c. Enterovirus

d. Retro virus

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

a. Hyaluronides

b. Hemolysin

c. Phosphate

d. Streptokinase

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18) Epstein-Barr Virus (EBV)?

a. Group A infect: skin and mucous membranes

b. Cause of infectious mononucleosis

c. Achieves latency in sensory ganglia

d. Betaherpesvirus subfamily of herpesviruses

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

a. Fusobacterium nucleatum and Streptococcus mutans

b. Fusobacterium nucleatum and Actinomyces viscosus

c. Fusobacterium nucleatum and Spirochetes

d. Staphylococcus aureus and Streptococcus mutans

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

a. It causes chronic granulomatous infections

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

c. It is a eukaryote

d. Short rods, but often pleomorphic

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22) Porphyromonas gingivalis:?

a. Are isolated from many extra oral sites

b. Are Gram-positive pleomorphic rods

c. Are aggressive periodontal pathogens

d. Are non-capsulated

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23) 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. Actinomyces

d. Staphylococcus aureus

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24) Herpagina is usually cause by?

a. Cytomegalovirus

b. Hepatitis A virus

c. Group B coxackieviruses

d. Group A coxsackieviruses

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25) 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. Lactobacillus

c. Bacteroides

d. Staphylococcus

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26) 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. Extracellular glucan production.

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

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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 zoster

c. Paramyxovirus

d. Herpes simplex

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28) Mumps virus is belonging to?

a. Retroviriae

b. None of these

c. Orthomyxoviridae

d. Paramyxoviridae

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29) Main causative organism of chicken pox is?

a. Measles virus

b. Fox virus

c. Varicella Zoster virus

d. Mumps virus

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

a. Proteases, haemolysin and collagenase

b. Cytotoxins

c. Hyaluronic acid

d. Adhesins

Your score is

The average score is 91%

Any comments?

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