The natural habitat of L. pneumophila is:
a. freshwater streams.
b. the upper respiratory tract of humans and animals.
c. the large intestine of humans and animals.
d. foods contaminated by soil.
A
In nature, legionellae are found primarily in aquatic habitats and thrive at warmer temperatures; these bacteria are capable of surviving extreme ranges of environmental conditions for long pe-riods; studies have shown that L. pneumophila can survive for up to 14 months in water with on-ly a slight loss in viability. Legionella spp. have been isolated from the majority of natural water sources investigated, including lakes, rivers, and marine waters, as well as moist soil. Organisms are also widely distributed in man-made facilities, including air-conditioning ducts and cooling towers; potable water; large, warm-water plumbing systems; humidifiers; whirlpools; and tech-nical-medical equipment in hospitals.
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Which of the following is defined as genetic change in a population from generation to generation?
A. heredity B. phenotype C. evolution D. genotype E. mitosis
After rigorous statistical analyses have shown a very low likelihood (usually 5% or less) of a result having occurred by
chance alone, the result is said to be ____.
a. quantitatively probable b. probably random c. statistically significant d. due to sampling error e. statistically probable
A decomposer
a. is exemplified by a fungus. b. is the same as a parasite. c. feeds on living organic material. d. feeds on primary consumers only.
Most of the plant body is composed of
a. dermal tissue. b. root tissue. c. ground tissue. d. vascular tissue. e. cork tissue.