Members of the genus Rhizobium ________.
A. grow symbiotically in root nodules of legumes where they fix nitrogen
B. are important nitrifying bacteria that convert nitrite to nitrate
C. infect broad-leaved plants and cause crown gall disease
D. are free living soil bacteria that fix nitrogen
Answer: A
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An animal with bilateral symmetry
a. has left and right sides. b. usually displays cephalization. c. produces mirror images regardless of the number of "cuts" through the central axis. d. has left and right sides and usually displays cephalization. e. has left and right sides, usually displays cephalization, and produces mirror images regardless of the number of "cuts" through the central axis.
Which important finding from the fossil record supports the theory of evolution?
a. Life has evolved over time. b. All life evolved in the ocean. c. Most species are actually extinct. d. There is an inaccuracy in the fossil record. e. Ancient species greatly differed from those alive today.
Among important crop plants, nitrogen-fixing root nodules are most commonly an attribute of
a) wheat. b) cabbage and other members of the brassica family. c) legumes. d) corn. e) members of the potato family.
The shaded group includes all of the species that were derived from one common ancestor, this group could also be called a(n) 
A. paraphyletic taxon. B. homology. C. clade. D. polyphyletic taxon. E. phylum.