Oral Microbiology Preparation (Ph. Heng Kanika)

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135

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1) During AIDS, HIV infects?

a. CD4 lymphocytes

b. B Lymphocytes

c. CD3 lymphocytes

d. CD2 lymphocytes

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

a. Short rods, but often pleomorphic

b. It is a eukaryote

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

d. It causes chronic granulomatous infections

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4) Causative agent of scarlet fever?

a. None of these

b. Streptococcus viridans

c. Streptococcus pyogens

d. Staphylococcus aureus

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

a. Transferred by insects bite.

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

c. Required by transient flora

d. Transferred by hands or objects

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7) Main causative organism of chicken pox is?

a. Fox virus

b. Measles virus

c. Varicella Zoster virus

d. Mumps virus

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8) Mumps virus is belonging to?

a. Paramyxoviridae

b. Orthomyxoviridae

c. Retroviriae

d. None of these

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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 A coxsackieviruses

b. Hepatitis A virus

c. Group B coxackieviruses

d. Cytomegalovirus

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11) 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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12) Certain strains of Streptococcus mutans?

a. Are cause of infective meningitides

b. Extracellular glucan production.

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

a. Adhesins

b. Hyaluronic acid

c. Cytotoxins

d. Proteases, haemolysin and collagenase

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14) Fusobacterium Nucleatum 😕

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

b. Gram-positive, strictly anaerobic

c. Isolated from monomicrobial infections

d. Non capsulate diplococci

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15) 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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16) AIDS virus is ?

a. DNA virus

b. Enterovirus

c. RNA virus

d. Retro virus

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17) 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. Paramyxovirus

c. Epstein-Barr

d. Herpes zoster

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18) Fusobacterium Nucleatum 😕

a. Cause scarlet fever

b. Black pigmented Gram-negative microorganism

c. Implicated in Dental caries

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

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19) Which microorganism implicated in pit and fissure caries?

a. Streptococcus mutans

b. Actinimyces viscosus

c. Streptococcus mitis

d. Staphylococcus aureus

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20) Epstein-Barr Virus (EBV)?

a. Group A infect: skin and mucous membranes

b. Betaherpesvirus subfamily of herpesviruses

c. Cause of infectious mononucleosis

d. Achieves latency in sensory ganglia

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

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

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

c. Microaerophilic

d. Black pigmented Gram-positive

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22) Porphyromonas gingivalis:?

a. Are non-capsulated

b. Are isolated from many extra oral sites

c. Are aggressive periodontal pathogens

d. Are Gram-positive pleomorphic rods

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23) 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. Bacteroides

c. Staphylococcus

d. Lactobacillus

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

a. Streptodornas

b. Hyaluronidase

c. hemolysine

d. leukotoxin A

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25) Primary herpesvirus infections may cause:?

a. Herpes zoster

b. Meningititis

c. Herpetic gingivostomatitis

d. Herpes labialis

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

a. Hemolysin

b. Phosphate

c. Streptokinase

d. Hyaluronides

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27) 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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28) Coxsakievirus have been found to replicate in the?

a. Small bowel

b. Reticuloendothelial system

c. Submucosal lymph tissue

d. Sensory nerve

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

a. Porphyromonas gingivalis

b. Actinomyces viscosus

c. Fusobacterium Nucleatum

d. Staphylococcus aureus

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30) Cryptococcosis?

a. Is a localized inflammation around and under the nails

b. Is associated with dog lovers

c. Is an infection caused by Cryptococcus neoformans

d. Can cause cardiac abnormalities

Your score is

The average score is 89%

Any comments?

Any problems/errors or mistakes found while testing, please let us know for modification!

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