HW2 key - Biology 202 NAME: Fall 2007 T.A.: Homework 2...

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Biology 202 NAME: Fall 2007 T.A.: Homework 2 Discussion Section #: Due: September 6 or 8 in discussion 1. (2.5 pts) The following events, steps, or reactions occur during E. coli replication. For each entry in Column A, select the appropriate entry in Column B. Each entry in Column A may have more than one answer, and each entry in Column B may be used more than once. Column A Column B A. Unwinds the double helix C A. Polymerase I B. Prevents reassociation of complementary bases F B. Polymerase III C. Is an RNA polymerase D C. Helicase D. Is a DNA polymerase A B D. Primase E. Replaces RNA primers A E. Ligase F. Is the major elongation enzyme B F. SSB protein G. Is a 5’ to 3’ polymerase A B D G. Topoisomerase H. Is a 3’ to 5’ polymerase H H. None of these I. Has 5’ to 3’ exonuclease activity A J. Has 3’ to 5’ exonuclease activity B K. Bonds free 3’OH end of a polynucleotide to a 5’ end of another polynucleotide E L. Bonds 3’OH end of a polynucleotide to a free 5’ nucleotide triphosphate A B D M. Relieves tension in unwinding DNA G 2. (1 pt) Why does the lagging strand have to be replicated discontinuously during DNA replication? DNA replication is only performed in a 5’ to 3’ direction. Therefore, only one strand (the leading strand) can be replicated in the same direction as the replication fork. To
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HW2 key - Biology 202 NAME: Fall 2007 T.A.: Homework 2...

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