The main effect of burning peat, wood, coal, and petroleum on the Earth's climate is:
A. The fires significantly heat the air and cause a rise in global temperature.
B. The smoke blocks sunlight from reaching the Earth and causes a significant lowering of the Earth's temperature.
C. The fires release back into the atmosphere carbon dioxide that was once taken from the atmosphere by plants and stored in their own tissues; the increased carbon dioxide holds in solar heat and causes a rise in temperature.
D. The rising heat from fires produces wind that cools the surface of the Earth.
E. The fires use up oxygen that would otherwise block penetration of ultraviolet light from reaching the Earth; the increased ultraviolet radiation heats the Earth.
C. The fires release back into the atmosphere carbon dioxide that was once taken from the atmosphere by plants and stored in their own tissues; the increased carbon dioxide holds in solar heat and causes a rise in temperature.
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Tetrads are:
A. composed of a pair of nonhomologous chromosomes. B. composed of two pairs of sister chromatids. C. formed in prophase II of meiosis. D. lined up along the cell axis during metaphase II. E. formed during DNA synthesis.
A mutation in the Apetala1 gene, in Brassica
oleracea plants (wild cabbage) results in mutated flowers that a. have multiple female parts. b. have multiple male parts. c. have leaves instead of petals. d. have enormous size. e. burrow into the ground like peanuts.
A DNA molecule has four "ends"— two on each of the two polynucleotide strands. How many of
these ends are phosphate groups? Fill in the blank(s) with the appropriate word(s).
Nauplius, a unique kind of larva, is characteristic of
A. crustaceans. B. mites. C. horseshoe crabs. D. insects. E. chelicerates.