The Saguaro cactus is a large cactus found in some southwestern desert environments. It plays
a central role in providing habitat for a variety of other species, and if these cacti die or are
removed from the ecosystem, biodiversity declines. Thus, the Saguaro cactus is a
__________.
a. keystone species
b. tertiary consumer
c. generalist
d. trophic level
A
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In some societies, the birth of a deformed child is regarded as a sign of impending war or famine
a. True b. False Indicate whether the statement is true or false
The 3-day test that is useful for identifying the rapid-growers, M. fortuitum and M. chelonae, and that measures the rate by which this enzyme breaks down phenolphthalein disulfate into phe-nolphthalein and other salts is the ____________ test
a. niacin. b. phenolphthalein. c. arylsulfatase. d. Tween 80.
The methanogens, producers of methane gas, require environments that
A. are directly exposed to sunlight. B. have abundant oxygen and CO2. C. are extremely cold. D. are very acidic. E. are anaerobic with hydrogen gas and CO2.
The set of mRNAs that share a particular mRNA-binding protein is called a(n)
a. regulatory RNA unit. b. mRNA cohort. c. mRNA community. d. RNA regulon. e. mRNA family.