超星 - 四体--章节练习

单选题

Each of the following statements concerning spirochetes is correct EXCEPT

A. Species of Borrelia are part of the normal flora of the mouth
B. The species of Leptospira that cause leptospirosis grow primarily in humans and are usually transmitted by human-to human contact
C. Species of Borrelia cause a tick-borne disease called relapsing fever
D. Species of Treponema cause syphilis and yaws

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单选题

From a public health perspective, in which of the following stages of syphilis can a person be considered not infectious?

A. Primary
B. Secondary
C. Tertiary
D. Reactivated latent

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单选题

Which of the following mycoplasmas has been implicated as a cause of nongonococcal urethritis (NGU)?

A. Mycoplasma pneumoniae
B. Ureaplasma urealyticum
C. Mycoplasmafermentans
D. Mycoplasmamycoides

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单选题

An 18-year-old sexually active woman develops left lower quadrant pain and fever. On pelvic examination, she has tenderness in the left adnexa, and a mass suggestive of a uterine tube abscess is palpated. The patient is diagnosed with pelvic inflammatory disease. Which of the following bacteria is considered to be a common cause of pelvic inflammatory disease?

A. Bacillus cereus
B. Haemophilus influenzae
C. Mycoplasma pneumoniae
D. Chlamydia trachomatis

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单选题

Which of the following is important in the pathogenesis of mycoplasmal infections?

A. The presence of lacto-N-neotetraose with a terminal galactosamine as the host cell receptor.
B. The peptidoglycan in the mycoplasmal cell wall.
C. The structures and the interactive proteins that mediate adhesion to host cells.
D. The absence of cilia on the surface of the host cells.
E. Growth in an anatomic site where anaerobic organisms thrive.

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单选题

A 25-year-old medical student has contact with a patient who has pneumonia with fever and cough. Four days later, the medical student develops fever and cough, and chest radiographs show consolidation of the right lower lobe. Routine bacterial sputum culture results are negative. Pneumonia caused by Mycoplasma pneumoniae is considered. All of the following are methods to confirm the clinical suspicion except

A. PCR amplification of Mycoplasma pneumoniae DNA in sputum
B. Culture of sputum for Mycoplasma pneumoniae
Culture of a lung aspirate for Mycoplasma pneumoniae
D. Gram stain of sputum smear
Enzyme immunoassay test of acute and convalescent sera

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单选题

Initiation of infection by Mycoplasma pneumoniae begins with

A. Elaboration of a polysaccharide capsule that inhibits phagocytosis
B. Secretion of a potent exotoxin
C. Adherence to respiratory epithelial cells mediated by P1 adhesin
D. Endocytosis by ciliated respiratory epithelial cells
E. Phagocytic uptake by alveolar macrophages

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