KEY_Exam2[1]

KEY_Exam2[1] - This exam in worth 100 points in the whole...

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Evolutionary Biology Exam II, Fall 2008 Part I A. Multiple Choice Questions. Choose the best possible answer . Use the bubble sheet. (1 pt. each) 1. When selection acts to eliminate one extreme from an array of phenotypes it is called (A) natural selection (B) stabilizing selection (C) disruptive selection (D) directional selection (E) artificial selection. 2. Which one of the following is not an example of a reproductive isolating mechanism? (A) sympatric isolation (B) behavioral isolation (C) ecological isolation (D) mechanical isolation (E) temporal isolation. 3. A behavior that has evolved to aid relatives, although at personal risk, and thus increases the chance of your genes being passed on to the next generation is known as (A) altricial behavior (B) instinctive behavior (C) kin selection (D) operant conditioning (E) adaptive behavior. 4. Which plants are characterized by a conducting system, the possession of cuticles, specialized stems, and roots, stomata, and, in many species, seeds? (A) liverworts (B) mosses (C) tracheophyta (D) horsetails (E) club mosses. 5. The infection cycle of HIV includes all of the following steps except (A) attachment (B) entry (C) replication (D) immediately killing the host cell (E) viral DNA integrates into the host chromosome. 6. The gametophyte is green and nutritionally independent in (A) mosses, liverworts, and ferns (B) angiosperms (C) gymnosperms (D) conifers (E) cycads. 7. A microbiologist is conducting a research project on chemoautotrophs. This means that the investigator is examining certain aspects of a bacterium that (A) can oxidize sulfur (B) is a purple non-sulfur bacteria which depends on light (C) obtains carbon from organic molecules (D) can use the energy from sunlight to build organic molecules from carbon dioxide (E) uses light as its energy source and carbon for organic compounds. 8. The biological species concept of Ernst Mayr can be applied to all of the following except (A) sympatric organisms (B) allopatric organisms (C) eukaryotic organisms (D) prokaryotic organisms (E) asexually-reproducing organisms. 9. Plants lacking well-developed conducting systems such as mosses, liverworts, and hornworts have been called (A) gametophytes (B) sporophytes (C) angiosperms (D) gymnosperms (E) bryophytes. 1 This exam in worth 100 points in the whole course. You may take this part of the exam with you. D A C C D A A E E C
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10. The type of speciation that geographically isolates populations and results in the divergence of distinct species is called ____________ speciation. (A) gradual (B) sympatric (C) allopatric (D) sexual (E) adaptive. 2
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11. The genetic alteration of a cell's genome by the introduction of foreign DNA is called (A) transfection (B) transformation (C) transcription (D) translation (E) transduction. 12. The recessive phenotype of a trait occurs in 25% of a population. There are no selection pressures affecting this trait. What would be the expected frequency of the dominant allele after six generations of continued non-selection? (A) 0.25 (B) 0.306 (C) 0.50 (D) 0.494 (E) 0.75 13. If populations within a common area split into species, the process is known as (A) sympatric
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KEY_Exam2[1] - This exam in worth 100 points in the whole...

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