Which best describes the source of B. cepacia infections?
a. Rice paddies
b. Medical devices
c. Oropharynx of animals
d. Rodents
B
Plants, soil, and water serve as reservoirs of B. cepacia. This organism is able to survive on or in medical devices and disinfectants. Human acquisition of B. cepacia, resulting in colonization or infection, usually involves direct contact with contaminated foods; medical solutions, including disinfectants; and devices, such as respiratory equipment. Alternatively, person-to-person trans-mission also has been documented.
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In the early years of the twentieth century, ____ proposed that some genetic disorders and abnormalities of metabolism are related
a. Sir Archibald Garrod b. Francis Crick c. Linus Pauling d. Linda Bartoshuk e. Gregor Mendel
Which type of receptor detects low blood sugar levels, stimulating the organism to eat?
a. mechanoreceptors b. photoreceptors c. chemoreceptors d. thermoreceptors e. nociceptors
The effectiveness of geographic barriers in
promoting speciation is related most to a. the size of the barrier. b. the inability of the organisms to overcome the barrier. c. the speed at which the barrier forms. d. how long the barrier exists. e. the size of the population it separates.
If a poplar forest is attacked by gypsy moths, how do the trees around the infected area tend to become somewhat resistant?
What will be an ideal response?