Which statement best explains the finding that the nuclear DNA of house cats and African wild cats has a very high degree of similarity?
A. House cats and African wild cats share a recent common ancestor.
B. Divergent morphological evolution has occurred.
C. House cats and African wild cats are both members of the family Felidae.
D. Environmental pressures were the same.
Answer: A. House cats and African wild cats share a recent common ancestor.
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Other microorganisms besides coliforms that have been used as indicators of fecal contamination may be
A. Clostridia. B. Enterococci. C. bacteriophages. D. Bacteroides. E. Clostridia, Enterococci AND bacteriophages
Which of these is an incorrect comparison between flagella and cilia?
A. Flagella are longer structures than cilia. B. Flagella have essentially the same internal structure of cytoskeleton proteins as cilia. C. Flagella are used for propulsion, while cilia are used to attach cells to other cells or surfaces. D. Flagella and cilia are both used for types of cellular movement. E. Flagella are found in all three domains of organisms, while cilia are found only in Eukarya.
Osteoporosis is a condition characterized by
a. excessive build up of bone calcium deposits. b. hardening of the arteries in the bone. c. loss of bone mass. d. excessive rigidity of some bones. e. curvature of the spine.
Which statement best sums up our understanding of how animals navigate during migration?
A. We have a thorough understanding of orientation but not navigation. B. Animal navigation is a complete mystery. C. The mechanisms have been worked out in great detail, from the genes involved, to the brain structures, to the resulting behavior. D. We have some understanding of the information different animals rely on (sun, stars, or magnetic fields), and some sensory structures, but beyond that the mechanisms are still mysterious.