Exam3ak - Genetics and Cellular Biology (Biol 204) EXAM...

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Genetics and Cellular Biology (Biol 204) Name _______________________________ EXAM THREE March 30, 2007 Each question is worth 2 points. Circle the letter that indicates the best answer. a) b) c) d) 1. The idea that antibodies pre-exist the exposure to an antigen and that the matching of an antibody to an antigen causes the proliferation of the B cell that possesses the matching antibody is called: a) clonal selection theory. b) class switching theory. c) natural selection theory. d) endosymbionic theory. 2. Dendritic cells serve as: a) the main source of antibodies. b) “professional” APCs. c) the precursors of NK cells. d) the initiators of the JAK-STAT pathway. 3. When unmethylated cytosine, which normally pairs with guanine, is deaminated, it becomes uracil, which normally pairs with adenine. Why are such deaminations not usually a problem? a) uracil works just as well as cytosine. b) uracil is subject to depurination. c) DNA uracil glycosylase recognizes and removes the offending uracil. d) transversion mutations are rarely a problem. 4. This term specifically refers to a mutation that is not transmitted to a progeny but produces an organism that is a mosaic of mutant and normal tissue: a) somatic mutation. b) germ-line mutation. c) conditional mutation. d) gain-of-function mutation. 5. The acquired immune response is characterized by two broad categories: Cell mediated immunity and humoral immunity. Humoral immunity is carried out by: a) Natural killer cells. b) Cytotoxic T cells. c) Antibodies . d) Macrophages. 6. Mismatch repair is an operation where a region on one strand is partially removed and replaced using the other strand as a template. How does the mechanism decide which strand to remove? a) One strand is chosen randomly. b) The hypomethylated strand is chosen. c) The hypermethylated strand is chosen. d) The strands are compared to homologous strands in other cells. 7. A common technique for assessing the reliability of a node in a gene tree involves randomly sampling and replacing sequence data. This statistical technique is called: a) neighbor joining. b) bootstrapping. c) taxon sampling. d) simple sequence repeats. 8. Each family of transposable element has its own _________________ that determines the distance between the cuts 1
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made in the target DNA strands. a)
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This note was uploaded on 04/18/2008 for the course BIOL 204 taught by Professor Auger during the Spring '08 term at SD State.

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Exam3ak - Genetics and Cellular Biology (Biol 204) EXAM...

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