What type of molecules, embedded in phospholipid bilayers, transport hydrophilic molecules into or out of the cell?
A) carbohydrates
B) proteins
C) nucleic acids
D) lipids
B
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What is production efficiency?
A. The rate of photosynthetic fixation as a function of temperature. B. The percentage of energy assimilated by an organism that becomes new biomass. C. The amount of energy used by organisms at every node of a food web. D. Consumption of primary production by the second and third levels of a food web. E. The net gain to an ecosystem based on photosynthetic production.
In which of the following diseases does the spleen enlarge?
A. infectious mononucleosis B. malaria C. leishmaniasis D. brucellosis E. All of the choices are correct.
Which of the following food chains will allow the most energy to be available for human use?
a. corn ? cow ?humans b. corn ?humans c. algae?minnows?fish?humans d. alfalfa?cow?milk?humans e. corn?hen?eggs?humans
Which parasite is carried by Cyclops, an arthropod commonly found in still water?
A. Taenia saginata B. Schistosoma mansoni C. Dracunculus medinesis D. Fasciola hepatica E. Toxoplasma gondii