exams 3 2008

exams 3 2008 - BIOLOGY 51/Principles of Biology/K. Land...

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1 BIOLOGY 51/Principles of Biology/K. Land Name_________________________ Exam 3/November 15, 2008 Directions: Read each question carefully and pick the one BEST choice for each question. Indicate your choice on the scantron sheet. Each multiple choice question is worth 2 points. 1. The step(s) between a plant's perception of a change in the environment and the plant's response to that change is (are) best called A) a mutation. B) hormone production. C) pH change. D) signal transduction. E) an "all-or-none" response. 2. Which of the following statements is (are) true of plants? A) Unlike animals, plants cannot respond to stimuli. B) Plants are stationary and are incapable of movement. C) Plants adjust their growth and development in response to environmental cues. D) Only A and B are true. E) A, B, and C are true. 3. Which of these conclusions is supported by the research of both Went and Charles and Frances Darwin on shoot responses to light? A) When shoots are exposed to light, a chemical substance migrates toward the light. B) Agar contains a chemical substance that mimics a plant hormone. C) A chemical substance involved in shoot bending is produced in shoot tips. D) Once shoot tips have been cut, normal growth cannot be induced. E) Light stimulates the synthesis of a plant hormone that responds to light. 4. Vines in tropical rain forests must grow toward large trees before being able to grow toward the sun. To reach a large tree, the most useful kind of growth movement for a tropical vine presumably would be the opposite of A) positive thigmotropism. B) positive phototropism. C) positive gravitropism. D) sleep movements. E) circadian rhythms. 5. Organisms with radial symmetry: A. are usually very active predators B. are only found among the Bilateria C. are never found among the Bilateria D. have a high degree of cephalization E. none of the above
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2 6. Both animals and fungi are heterotrophic. What distinguishes animal heterotrophy from fungal heterotrophy is that only animals derive their nutrition A) from organic matter. B) by preying on animals. C) by ingesting it. D) by consuming living, rather than dead, prey. E) by using enzymes to digest their food. 7. The young of some insects are merely small versions of the adult, whereas the larvae of other insects look completely different from adults, eat different foods, and may live in different habitats. Which of the following most directly favors the evolution of the latter more radical kind of metamorphosis? A) natural selection of sexually immature forms of insects B) changes in the homeobox genes governing early development C) the evolution of meiosis D) B and C only E) A, B, and C 8. What is the correct sequence of the following four events during an animal's development? 1.
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exams 3 2008 - BIOLOGY 51/Principles of Biology/K. Land...

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