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PCB3134 - Exam 1 Practice Test Key

PCB3134 - Exam 1 Practice Test Key - PCB3134 Test 1 Fall...

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PCB3134 - Test 1 Fall, 2006 1. Which of the following is a similarity between prokaryotes and eukaryotes? a. Both share an identical genetic language. b. Both share a common set of membrane-bound organelles. c. Both have plasma membrane of similar construction. d. Both share common metabolic pathways. (1) a , b and c (2) b, c and d (*) a , c and d (4) a and c (5) all of above 2. In a lytic viral infection, the virus _________. a. usually arrests normal cellular activities. b. redirects the cell to make new viral nucleic acids and proteins leading to the release of new viral progeny. c. integrates its DNA into the host cell's DNA. (1) a (2) b (3) c (*) a and b (5) b and c 3. What kind of bond results from an unequal sharing of electrons? (1) a (*) b (3) c (4) d (5) b and d 4. Which factor(s) determine the electronegativity of an atom? (1) a (2) b (3) d (4) a and d (*) a and c 5. Why are ionic bonds less important and weaker than one might think in living organisms? a. cells are mostly water ,which interferes with ionic bonds. b. cells are largely hydrophobic. c. they are crystals. (*) a (2) b (3) c
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(4) a and b (5) b and c 6. Where are hydrophobic interactions most likely to occur? (1) on the surface of a water-soluble protein (*) the core of a water-soluble protein (3) in contact with water molecules (4) between two charged molecules (5) between two ions 7. Which properties of water are a direct result of the plentiful H bonds that water can form? (1) a and b (*) a, b and c (3) a, b and d (4) a and d (5) all of the above 8. What bond is responsible for the branch points in glycogen? (1) α (1->4) glycosidic linkages
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