Antimicrobial therapy for H. pylori infection consists of:
a. penicillin, gentamycin, and imipenem.
b. clindamycin, ceftriazone, and carbapenem.
c. A proton pump inhibitor, clarithromycin, and metronidazole.
d. azithromycin alone.
C
Therapy for H. pylori infection is problematic. H. pylori readily becomes resistant if metronida-zole, clarithromycin, azithromycin, rifampin, or ciprofloxacin is administered as a single agent. Current regimens usually use triple-drug therapy that including a proton pump inhibitor, clarith-romycin, and either amoxicillin or metronidazole. An alternative and more simple regimen for patients with metronidazole-resistant strains is omeprazole or lansoprazole (proton pump inhibi-tors that cause rapid symptom relief while working synergistically with the antibiotics) and amoxicillin or clarithromycin. Relapses occur often. Helicobacter spp. associated with enteritis and proctitis may respond to quinolones, but ideal therapy has not been established.
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The surface defenses of the body consist of the ______ and the mucous membranes lining the digestive and respiratory tracts.
A. bone marrow B. skin C. T cells D. lymphocytes
A site in nature where a virus exists is its
A. capsid. B. bacteriophage. C. reservoir. D. clade. E. progenote.
Which of the following is TRUE regarding gene expression?
A) Different tissues within an organism express different genes. B) Different individuals of the same species express all of the same genes. C) Gene expression is not influenced by the environment. D) Gene expression remains constant throughout an organism's life span.
An example of a properly functioning homeostatic control system is seen when _____
A) the core body temperature of a runner rises gradually from 37°C to 45°C B) the kidneys excrete salt into the urine when dietary salt levels rise C) a blood cell shrinks when placed in a solution of salt and water D) the blood pressure increases in response to an increase in blood volume