The single most effective and practical way to prevent the spread of infection among patients is
A. placing patients in negative pressure rooms.
B. attentiveness of health care providers and patients to hand washing.
C. isolating patients in private rooms.
D. wearing gloves, gowns, masks.
Answer: B
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A lichen is made up of which two types of organisms?
A. a fungus and a nonvascular plant species B. a fungus and an algal species C. an alga and a vascular plant species D. an alga and a nonvascular plant species E. a fungus and either an algal or bacterial species
What is the cause of most peptic ulcers?
a. lactose intolerance b. heartburn c. bacteria d. malnutrition
What microscope is best to use to view the features of cell organelles?
A. Basic light microscope B. Phase contrast light microscope C. Nomarski process light microscope D. Scanning electron microscope E. Transmission electron microscope
Alien species are most likely to disrupt natural ecosystems when they:
A) are closely related to native species. B) are similar in appearance to native species. C) assume ecosystem roles of native species. D) are larger in size than native species.