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2012 Quiz 3 Key

2012 Quiz 3 Key - Biol241 2012 Quiz 3(20 points Name Purdue...

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Biol241 2012 Name:__________________________ Quiz 3 (20 points) Purdue ID:__________________________ 1 1) Regarding prokaryotic DNA polymerase I and III, which of the following statements is incorrect? a) Both DNA polymerase I and III have 3’-5’ exonuclease activity. b) DNA polymerase III is responsible for most of the strand elongation during DNA replication. c) Both DNA polymerase I and III have 5’-3’ exonuclease activity. d) Both DNA polymerase I and III add nucleotides to the 3’-end of growing chain. 2) A temperature-sensitive E. coli strain has been isolated. When grown at restrictive temperature, it was found that Okazaki fragments accumulated in the mutant cells. Based on this observation, this mutation likely disrupts: 3) A different temperature-sensitive E. coli strain has been isolated. When grown at restrictive temperature, it was found that the initiation of DNA replication occurred normally, but strand elongation ceased after a short while. Based on this observation, this mutation likely disrupts:
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