2nd bio exam 1407 answers - Introductory Biology, Biology...

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Introductory Biology, Biology 1407. TAMU-CC. 2 nd lecture exam 2 March 2007 section 001, 1-20 are 4 points each 1. Production of secondary compounds such as flavanols in Theobroma cacao occurs because: a. it happens as a side effect of making sugars, this is something that cannot be avoided b. natural selection favors trees that make larger amounts of flavanols c. these trees have been artificially selected to produce larger amounts of flavanols d. because flavanols aid in pollination of flowers allowing the tree to produce seeds e. flavanols are produced in the ancestor of flowering plants, this is a carryover from them You should have known I was going to ask about the chocolate lecture! This is a case of natural selection. Trees that make more flavanols have less herbivore damage than do trees that don’t make falvanols. 2. This grouping is: a. monophyletic b. polyphyletic c. paraphyletic This grouping has the ancestor and all its decedents so it is monophyletic. 3. Helianthus and Campanula are in the same class but different orders. Fragara and Rosa are in the same family but are different genera. Which pair is most closely related to each other? a. Fragara and Rosa b. Helianthus and Campanula c. cannot determine from the data given d. both pairs are related to each other to an equal degree Two organisms in the same family are more closely related to each other than are two organisms in the same class. 4. An example of behavioral isolation is found in Blue-footed Boobies. These inhabitants of the Galápagos mate only after a courtship display unique to their species. Part of the “script” calls for the male to high-step, a behavior that calls the female’s attention to his bright blue feet. Behavioral isolation is a:
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a. postzygotic reproductive barrier b. prezygotic reproductive barrier c. mechanism that prevents a hybrid zygote from developing into a viable, fertile adult d. mechanism that leads to polyploidy e. mechanism that leads to speciation If a bird doesn’t have this behavior or recognize this behavior, mating will not occur. Because no zygote can be formed if mating did not occur, this is a prezygotic reproductive barrier. 5. You find an organism that you haven’t seen before. It is about 35 cm across and growing on decaying wood. When you bring it to the lab and look at it under a microscope, you can’t find cells! The whole thing seems to be one large cell. There are several nuclei, but no cells. What is this? a. a cellular slime mold b. a multinucleate green algae c. a colony of bacteria d. a fungus e. not sure, but it is coenocytic This is a plasmodial slime mold, it is coenocytic. 6.
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This note was uploaded on 03/27/2008 for the course BIO 1407 taught by Professor Grise during the Spring '08 term at Texas A&M University, Corpus Christi.

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2nd bio exam 1407 answers - Introductory Biology, Biology...

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