The most economically important bryophyte is:
a. Equisetum.
b. Anthoceros.
c. Psilotum.
d. Sphagnum.
e. Lycopodium
D
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Approximately _____ percent of human births in the U.S. are the result of in vitro fertilization
a. 0.5 b. 1.5 c. 5 d. 10 e. 25
If global warming makes the southeastern United States warmer but does not change the amount of rainfall, we might expect to see a shift from the present temperate deciduous forest biome to
A) alpine tundra. B) tropical rain forest. C) chaparral. D) northern coniferous forest. E) tropical deciduous forest.
In a certain breed of chicken, two genes control color. A dominant allele (I) inhibits the expression of any color gene (C). The recessive allele (c) results in albinism when homozygous (cc). The F2 phenotypic ratios of a cross between a colored chicken (ii CC) with a white chicken (II cc) would be ____white, _____ colored.
Fill in the blank(s) with the appropriate word(s).
C4 photosynthesis
a. is the same as C3 photosynthesis, because it takes place in chloroplasts. b. occurs in plants whose bundle sheath cells contain chloroplasts. c. takes place in plants such as wheat, rice, and oats. d. is an advantage when the weather is hot and dry. e. Both b and d are correct.