test_1_key

Test_1_key - This exam has multiple choice questions(66 and short answer questions(33 Please read the exam over before starting When answering

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This exam has multiple choice questions (66%) and short answer questions (33%) Please read the exam over before starting. When answering questions, read them carefully and make sure you answer the question being asked, rather than some other question. Always think before you write. Be sure that you put your name and section number and student number on the scantron. THIS IS TEST FORM A. FILL IN THE APPROPRIATE BUBBLE ON THE SCANTRON. Also, be sure that you put your name and section number and student number on the last 2 pages of the exam; these will be separated from the rest of the exam for grading. This test is to reflect your work only . As a student at UC Davis, you are assumed to be familiar with, and have agreed to a code of conduct. This code forbids: Receiving or providing unauthorized assistance on examinations or using unauthorized materials during an examination Plagiarism - using materials from sources without citations or altering an exam and submitting it for re-grading If you are found to be in violation of this code, you will be referred to Judicial affairs. I’ve mentioned that one of the reasons I love studying biology is that it provides a way of understanding wonderful things. One of the most wonderful things I’ve ever seen is bioluminescence: on a dark night in summer, ocean water disturbed by a swimmer or by a boat will flash and sparkle with a greenish light. This is a biological phenomenon; the organism responsible is the single-celled diatom Gonyaulax (pronounced go-knee- ow!-lax). Not only is it pretty when it flashes, it’s pretty under the microscope: You now know enough biology to start to understand how Gonyaulax does what it does. 1/9
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1. It is still not known why Gonyaulax generates light when disturbed. One hypothesis suggests that it does this to attract attention when it is attacked, in the hopes that some larger predator will come along and attack its attacker. Why is this a good hypothesis? a) it is true b) it makes a testable prediction c) it has explains the observed phenomenon d) if it is true, it could provide explanations for other phenomena e) all except (a) are characteristics of a good hypothesis—hypotheses are never “true”—they are unfalsified 2. The chemical used by Gonyaulax to generate light is called luciferin. It undergoes the following reaction: QuickTime™ and a TIFF (LZW) decompressor are needed to see this picture. Note that the “forward” reaction produces water and light. Also, focus your attention on the lower right-hand portion of the Luciferin molecule. What is going on in the forward reaction? a) carbon is getting oxidized—it is getting two bonds to O b) carbon is getting reduced c) oxygen is getting oxidized d) entropy is increasing dramatically 3. Luciferin has a system of alternating C-C and C=C bonds, like chlorophyll and other pigments. This suggests that it a) has electrons that can be excited and move around the molecule b) has the ability to absorb light energy
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This note was uploaded on 06/15/2010 for the course BIS BIS2A taught by Professor Lucacomai during the Summer '09 term at UC Davis.

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Test_1_key - This exam has multiple choice questions(66 and short answer questions(33 Please read the exam over before starting When answering

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