According to the phylogenetic tree showing evolutionary relationships among viruses in Figure 13.6, which one of the following is most closely related to the human lentivirus HIV2?
A. a horse lentivirus
B. another human lentivirus
C. a cow lentivirus
D. a simian lentivirus
E. a cat lentivirus
D
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Which was likely the first of the following metabolic pathways or structures to evolve?
A. fermentation B. the citric acid cycle C. electron transport complexes I, II, and III D. ATP synthase E. All four probably arose at the same time in an early prokaryote.
A climograph portrays the particular combination of temperature and rainfall conditions where each
terrestrial biome occurs.
Indicate whether the statement is true or false.What happens if an insect is sprayed with a common insecticide that destroys the ability of acetylcholinesterase to recycle acetylcholine?
A. The lack of recycled acetylcholine brings cell metabolism to a halt. B. This prevents the synapse from restoring its ability to "reset" itself for the next impulse. C. The insect loses control of body functions as nerve impulses flow continuously. D. All of the above are correct. E. The synapse is prevented from restoring its ability to "reset" itself for the next impulse and the insect loses control of body functions as nerve impulses flow continuously.
Which of the following tends to predominate in land ecosystems?
A. Grazing food web B. Primary production C. Food web D. Detrital food webs E. Biomass pyramid