Micro Final (1)

The mutans streptococci are both acidogenic and aciduric. With respect to these properties, which of the following statements BEST describes these bacteria?

Which of the following infections is preventable by a killed virus vaccine?

Which of the following viruses is the causative agent of vesicular lesions of the oral cavity?

Which two sites in the oral cavity would have the MOST similar types of microbial flora?

This antibiotic inhibits RNA synthesis and is useful in the treatment of tuberculosis

In periodontitis, the cells that predominate in the gingiva are

Which structure can be found in both gram-negative and gram-positive bacteria?

Heat-labile substances can be sterilized by which of the following?

Which of the following statements BEST describes the growth of a typical culture of bacterial cells such as Escherichia coli?

Besides being a receptor important for the binding of HIV-1 to target cells, CCR5 is a

Which of the following diseases associated with spongiform change of the brain?

A 50-year-old male suffers from painful ulcerative lesions confined only to his right shoulder. A DNA viral agent that is sensitive acyclovir is demonstrable in these lesions. The site of latency for this virus is

Enterotoxigenic Escherichia coli

A 4-year-old child is brought to a clinic with complaints of anorexia and sore throat. The child appears extremely ill. Oral examination reveals a gray pseudomembrane extensively involving the tonsils, uvula, soft palate and pharyngeal wall. The child complains of breathing difficulty. Attempts to remove the membrane are followed by bleeding. The mother indicates that the child has
not received any immunizations. The MOST LIKELY diagnosis is

Which of the following has been shown to be MOST IMPORTANT as an indirect stimulus of bone resorption?

A 27-year-old male who is homosexual has a scheduled appointment in the dental clinic. He complains of a low-grade, persistent fever and being tired all the time. He has swollen glands around his neck. You know that in the routine clinical testing for HIV-1 infection in adults, the first test which is done to screen patients for the presence of infection is the

A 45-year-old male has signs of pneumonia with coughing, difficulty breathing and fever. A chest X-ray reveals several spots in his lung. A stain of his sputum with the Ziehl-Neelsen stain reveals numerous long red rods. Which of the following statements is MOST APPROPRIATE regarding this patient?

Type IV hypersensitivity

Which of the following statements is CORRECT about IFN-_?

Abscesses of soft or hard tissues of the oral cavity are MOST FREQUENTLY caused by which one of the following organisms?

Enteroviruses are transmitted by contaminated food and water or by consuming uncooked seafood. These viruses are resistant to acid pH of the stomach and effectively multiply in the gut and cause extensive viremia. Which of the following diseases is caused by an enterovirus?

MHC class II molecules are important for

A genetically-engineered and purified envelope glycoprotein of a DNA tumor virus is used as a vaccine for which of the following diseases?

In advanced periodontitis, which group of microorganisms predominates in periodontal pockets?

Porphyromonas gingivalis is frequently isolated from patients with

Which of the following substances is unique to gram-positive bacteria?

A 32-year-old female has been diagnosed as infected with HIV-1. Which of the following tests is BEST used to monitor the course and progression of infection?

The satellite phenomenon would be helpful in the growth and isolation of

Product of neutrophils which causes bone resorption and is involved in periodontal disease

Which of the following is a CORRECT statement about Vibrio cholerae?

If Streptococcus mutans is grown in liquid media with sucrose as a carbon source, what is the predominant metabolic breakdown product produced?

Characteristics of Nocardia species include

Which one of the following antibiotics is contraindicated for young children and pregnant females because the drug interferes with tooth and bone development?

The transfer of multiple antibiotic resistance genes from one bacterium to another bacterium is commonly associated with

An agent that kills spores

Spores from Bacillus stearothermophilus

Which of the following species of streptococci would MOST LIKELY be isolated from a plaque sample from an 18-year-old dental student from Tennessee?

A patient is diagnosed with a lung abscess. Bronchoscopic examination reveals material containing sulfur granules. The disease is MOST LIKELY caused by

Ludwig's angina is MOST COMMONLY a complication of

Which of the following agents is responsible for a short incubation, acute hepatitis transmitted by contaminated seafood?

A 6-year-old boy from a developing country suffers from rashes on his face and trunk. The rashes disappear within 6 days of onset. Examination of his oral cavity reveals bluish-white ulcerations opposite to the lower molars. A known paramyxovirus that can cause neurological complications is isolated from his blood. Which of the agents BEST fits this description?

Which of the following is expressed on the surface of a T cell?

Cytokine produced by lymphocytes extracted from gingival tissue, which is cytotoxic for gingival fibroblasts

The periodontal pathogens, Porphyromonas gingivalis, Prevotella intermedia and Bacteroides forsythus, have this characteristic in common

The classical pathway of complement is characterized by

Changes in pili antigens of Neisseria gonorrhoeae are caused by

Condyloma acuminata or genital warts is associated with proliferation of epithelial cells covering the external genitalia. Persistent infection by a non-enveloped virus is a major factor in this disease. Which of the following is also TRUE for this agent?

Which of the following is caused by a DNA virus that multiplies exclusively in the cytoplasm?

Antigenic shift does not occur in influenza B or C viruses, because these two types of viruses are found only in

A major virulence determinant of Streptococcus mutans is associated with its ability to produce which of the following extracellular enzymes?