Answer the following statements true (T) or false (F)
1. The fossil record shows that angiosperms evolved directly from the Gnetophytes.
2. Incomplete flowers can be perfect flowers but imperfect flowers cannot be complete flowers.
3. Stamens and carpals are, in fact, modified sporangia-bearing leaves.
4. Horizontal gene transfer is restricted to prokaryotes and protists.
5. Secondary metabolites can be used to distinguish between different species of plants.
1. FALSE
2. TRUE
3. TRUE
4. FALSE
5. TRUE
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Refer to the accompanying figure. In every case, caterpillars that feed on oak flowers look like oak flowers. In every case, caterpillars that were raised on oak leaves looked like twigs. These results support which of the following hypotheses?
A) The longer day lengths of summer trigger the development of twig-like caterpillars. B) Differences in air pressure, due to elevation, trigger the development of different types of caterpillars. C) Differences in diet trigger the development of different types of caterpillars. D) The differences are genetic. A female will either produce all flowerlike caterpillars or all twig-like caterpillars. A) The longer day lengths of summer trigger the development of twig-like caterpillars. B) Differences in air pressure, due to elevation, trigger the development of different types of caterpillars. C) Differences in diet trigger the development of different types of caterpillars. D) The differences are genetic. A female will either produce all flowerlike caterpillars or all twig-like caterpillars.
A keystone species
a. has a disproportionately large effect on a community relative to its abundance b. controls the prey species. c. may increase or decrease the number of prey species in a community. d. has a disproportionately large effect on a community relative to its abundance, and may increase or decrease the number of prey species in a community. e. has a disproportionately large effect on a community relative to its abundance, controls the prey species, and may increase or decrease the number of prey species in a community.
Simple diffusion and facilitated diffusion are related in that both
(A) require protein carriers (B) depend on a concentration gradient (C) occur via contractions of cytoskeletal elements attached to membrane proteins (D) are endergonic processes and thus require the hydrolysis of ATP (E) occur in eukaryotic cells but not in prokaryotic cells
Leading source of lead in U.S.
a. Fuel combustion b. Waste disposal C. Metal processing D. Non-road engines and vehicles