A community
a. includes all populations of all species in a given area.
b. features the living organisms interacting with the physical and chemical environment.
c. is the sum of all places in Earth's atmosphere, crust, and waters where organisms live.
d. includes members of only one species.
e. is at a higher level of organization than an ecosystem.
ANSWER: a
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One surprise from comparative genome projects is that
A) all species examined so far have the same genes. B) we do not know the function of a great many genes. C) small organisms can have large genomes. D) large organisms can have small genomes.
Figure "B" in the above pair is a
a. cotyledon. b. petiole. c. dicot; evergreen. d. veins.
Match the reactant in the citric acid cycle on the left with the appropriate enzyme on the right
A) citrate synthase B) fumarate hydratase C) succinyl CoA synthetase D) aconitase E) malatase F) succinate dehydrogenase G) fumarate dehydrogenase H) malate dehydrogenase 1) oxaloacetate 2) malate 3) citrate 4) fumarate 5) succinyl CoA
Of the choices listed, the first event that occurs during embryonic development is:
A) organogenesis. B) blastula formation. C) cleavage. D) germ layer formation.