mt2key3 - BIS 1B Midterm 2 Rosenheim and Kimsey ANSWER KEY...

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1 BIS 1B Midterm 2 Rosenheim and Kimsey ANSWER KEY Winter 2004 Questions 1-14: Multiple choice questions (4 points each; total 56 points) Select one best answer and mark SCANTRON form using a #2 pencil. Be sure to put your name and student ID on the SCANTRON (and circle answer on the exam). 1. Flatworms with complex life cycles, involving multiple intermediate hosts, compensate for significant mortality occurring at each transition in their life cycle by a. providing each egg with abundant yolk as a nutritional reserve b. providing extensive parental care to their offspring, to ensure that each has a high chance of locating suitable hosts c. producing a large number of eggs d. having immature stages that undergo repeated rounds of asexual reproduction e. both c and d are true Answer: e 2. The two-fold cost of sex a. suggests that a rare mutant that reproduces asexually would spread rapidly through a sexually reproducing population b. suggests that asexual reproduction would be costly in the short term, but beneficial in the long term c. suggests that sexual reproduction occurs in gonochoristic species but not in hermaphroditic species d. occurs in species where the father assists the mother in producing offspring e. none of the above is true Answer: a 3. The Porifera or sponges possess a number of different kinds of cells that a. exhibit a division of cellular labor not seen in other organisms that have cells resembling choanocytes b. are "totipotent" and can change both form and function c. line a unique system of pores, canals and chambers that form a filter feeding system d. do not derive from an embryological germ layering system e: all of the above are true Answer: e: 4. The groups circled in the following cladogram depict a clade that is a. Monophyletic
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2 b. Paraphyletic c. Polygenic d. Polyphyletic e. Polymorphic Answer: b. 5. Which of the following is NOT a component of the hydrostatic skeleton found in Oligochaete annelids a. circular muscles b. longitudinal muscles c. coelomic fluid d. a flexible cartilaginous rod e. bundles of setae that can be extended from the body or retracted Answer: d 6. In molluscs, it has been suggested that metamerism is a. like the shell, a fundamental structural theme characterizing all of the diverse molluscan taxa b. falsely exemplified by the repeated sets of gills and shell plates of the Polyplacophora c. seen in the structure of ctenidial gills of bivalves d. a trait that indicates a polyphyletic origin of the Mollusca e. exemplified by the repeated rows of teeth on the radula of snails Answer: b 7. Colonial Cnidarians might be favored over solitary individuals because
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This note was uploaded on 04/15/2008 for the course BIS 1b taught by Professor Kimsey during the Spring '08 term at UC Davis.

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mt2key3 - BIS 1B Midterm 2 Rosenheim and Kimsey ANSWER KEY...

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