In studying osteoporosis in humans, you wish to test a newly designed treatment for efficacy. Your best choice for a model organism would be
A) Escherichia coli.
B) Mus musculus.
C) Caenorhabditis elegans.
D) Arabidopsis thaliana.
E) Pisum sativum.
B) Mus musculus.
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Assume that you are studying a trait determined by a number of polygenes. If there are seven phenotypic categories, how many genes are probably involved?
What will be an ideal response?
Why is an estuary considered an intermediate biome?
A) It is the transition zone between freshwater and saltwater biomes. B) It is intermediate in size, smaller than the largest biomes but larger than the smallest biomes. C) It will seasonally dry up and cease to be a biome. D) It is only a biome during high tide.
Gause's principle of competitive exclusion is based on the idea that ____.
A. larger organisms exclude smaller ones through competition as in the case of large trees controlling underbrush B. competition for the same resources excludes species having different life styles C. no two species can occupy the same niche indefinitely when resources are limited D. two species can coexist if their niches do not overlap E. species survival depends upon coevolution
Which of the following statements about water is false?
A) Ice is denser than liquid water. B) Water naturally exists in all three physical states on Earth. C) Floating ice on a pond insulates the liquid water below, slowing its rate of freezing. D) If ice sank, the oceans would eventually freeze solid.