The greatest proportion of which two biomes have been converted to agriculture?
a. taiga and tropical rain forest
b. tropical rain forest and temperate rain forest
c. temperate deciduous forest and temperate grassland
d. chaparral and tropical rain forest
e. temperate grassland and savanna
c
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Class III biological safety cabinets:
a. sterilize the air as it passes over the ma-terial in the cabinet. b. protect the environment from contamina-tion by biological agents by filtering the air as it is exhausted from the cabinet. c. are completely enclosed and have gloves that enable the worker to manipulate the material in the cabinet. d. are often called laminar flow hoods.
A gaseous hormone produced by plants that helps control fruit ripening is
A. carbon dioxide. B. auxin. C. ethylene. D. chlorophyll. E. carotene.
The best model organism for studying cell fate from fertilized egg through adult is
A) Arabidopsis thaliana. B) Caenorhabditis elegans. C) Drosophila melanogaster. D) Mus musculus. E) Saccharomyces cerevisiae.
Many forest plants and animals have been found to have chemicals in them that can be used for medicines. Which of the following is least helpful in preserving this resource?
A) eating more hamburgers B) limiting new housing developments C) encouraging paper and wood recycling D) promoting nut tree growing