RealMidterm1Key

RealMidterm1Key - BILD 3 Spring 2008 Dr Kohn Mid-term...

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BILD 3, Spring 2008. Dr. Kohn Mid-term Page 1 Section/TA _______________________ Name_______________________ Directions: There are 9 pages in this exam, not including this cover sheet. Please put your name on each page. Only exams written in ink will be accepted for regrades. The exam is closed book and closed notes and no calculators may be used. There are 37 questions . Please be sure your exam is complete. Read each question carefully. Think before you write and confine your answer to the space provided. You can use the bottom of this page for scratch, but nothing written on this page will be graded. We will collect exams promptly at 12:20. Page 2. 22 Page 3. 17 Page 4. 19 Page 5. 22 Page 6. 18 Page 7. 4 Page 8. 18 Page 9. 16 Page 10. 14 Total 150 (Space below this line for scratch)
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BILD 3, Spring 2008. Dr. Kohn Mid-term Page 2 Section/TA _______________________ Name_______________________ 1. (4pts) If you go to the nursery to buy a bryophyte the bulk of your purchase is a. haploid gametophyte b. diploid sporophyte c. haploid sporophyte d. nonvascular seed plant e. plant with flowers hidden on the underside of the leaves 2. (4pts) Which of the following is not a potential premating isolating mechanism? a. courtship display b. breeding season c. sperm-egg incompatibilities d. male breeding plumage e. non overlapping geographic ranges 3. (6pts) Name one of the three reasons discussed in class for why we observe a Cambrian Explosion of diversity in the fossil record. 1. Fossil record incomplete, diversification could have begun earlier. 2. Tens of millions of years still a very long time for evolution to take place. 3. Key innovations such as jointed appendages and jaws may have lead to escalation of biotic interactions and rapid co-evolution. Motile jawed predators select for defenses of prey (e.g. legs, shells, sensory capabilities)." 4. (4pts) Define a paraphyletic group and explain why dinosaurs are paraphyletic.? Answer: A group that contains the common ancestor but not all descendants of that common ancestor. Dinosaurs are paraphyletic unless birds are included in them. 5. (2pts) Which of the following is not a true statement about the xylem. a. The cell walls are strengthened with cellulose and lignin b. It consists of living cells. c. It conducts most of the water and minerals through the plant. 6. (2pts) True/ False (circle one) Aerobic prokaryotes originated before cyanobacterias.
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BILD 3, Spring 2008. Dr. Kohn Mid-term Page 3 Section/TA _______________________ Name_______________________ 7. (6pts) Why is it advantageous for the bacterium Wolbachia (which infects mosquitoes) to cause cytoplasmic incompatibility whereby matings between infected male and uninfected female mosquitoes are sterile? Wolbachia
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RealMidterm1Key - BILD 3 Spring 2008 Dr Kohn Mid-term...

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