Which statement is TRUE about Streptococcus pneumoniae and the lung infection it causes?
A) Streptococcus pneumoniae can spread from the focus of infection as a bacteremia.
B) Penicillin and erythromycin are the last chance drugs for treatment of streptococcal pneumonia.
C) Infection with any strain of encapsulated virulent Streptococcus pneumoniae provides long-lasting immunity to all encapsulated virulent strains.
D) Streptococcal pneumonia is not as serious as most people think; if left untreated, it usually runs its course in about a week to ten days.
Which of the following is the causal agent of gastric ulcers?
A) Staphylococcus aureus
B) Escherichia coli O157:H7
C) Helicobacter pylori
D) Vibrio cholerae
Which of the following is/are used to identify methicillin-resistant Staphylococcus aureus?
A) selective media
B) differential media
C) PCR
D) selective media, differential media, and PCR
The CD4 molecule is
A) an HIV surface glycoprotein.
B) a cell-surface protein receptor for HIV.
C) found only on T-helper cells.
D) an HIV surface glycoprotein that is found only on T-helper cells.
Which of the following drugs, chemotherapeutic agents against HIV, inhibits reverse transcriptase?
A) ampligen
B) azidothymidine
C) alpha interferon
D) soluble CD4
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