Which of the following is the meaning of "essential" in the phrase essential amino acid?
A) An essential amino acid is one which is included in the primary structure of all proteins.
B) An essential amino acid is one which is necessary for a protein to adopt the proper secondary or tertiary structure.
C) An essential amino acid is one which cannot be synthesized by the human body or which can be synthesized but not in sufficient quantities for the body's needs.
D) None of the above is correct.
C
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Which of the following statements is false?
a. In the process called speciation, one species splits into two or more different species. b. Geographic and reproductive isolation occur in sequence. c. Sooner or later all species become extinct. d. By definition, the fittest animals are the largest and strongest animals. e. Difference environmental conditions lead to different selective pressures.
Invasive species have been
A) hunted to extinction in most places where they occur. B) successfully controlled in most regions using predators, viral agents, or bacterial agents. C) successfully controlled by the introduction of other alien species that are natural competitors. D) an ecological problem in North America since the first European colonists arrived.
Which of the following indices is most likely to increase as a result of people spending money to rebuild or relocate after a hurricane wipes out their town?
A) GPI B) GDP C) BLI D) GNH
Populations of zooplankton can ________.
A. accumulate at water-layer density boundaries B. move toward the sea surface at night C. accumulate at water-layer density boundaries and reflect sound waves D. accumulate at water-layer density boundaries, move toward the sea surface at night, and reflect sound waves E. reflect sound waves