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101A_Su09_midterm2key

101A_Su09_midterm2key - MCDB 101A Summer 2009 2nd...

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1 MCDB 101A Summer 2009 2nd Midterm Name_________ ____Key_ __________________________ 7/20/09 (100 points total) Perm #__________________________________________ Multiple Choice: Circle the letter corresponding to the best answer (3 points for each correct answer) 1. Which is true of RecA protein? No answer was correct: 3 free points! a. It is required for excision of lambda from its host DNA in response to nutrient depletion b. RecA-dependent recombinational bypass requires the gene products UmuC and UmuD c. It is necessary for the integration of phage lambda into bacterial DNA d. It plays a role in the repair of thymidine dimers that result from UV exposure e. All the above 2. Very Short Patch repair can correct/repair a. mismatches resulting from the product of 5-methyl cytosine deamination b. DNA bases modified by the attachment of aflatoxin c. pyrimidine dimers d. small insertions or deletions resulting from polymerase errors e. both b and c 3. Which is true of a silent mutation? 4. Which is a correct statement about nonsense suppressor mutations? 5. Which of the following is used in PCR? 6. Shown to the right is a base pair that resulted from tautomerization. The bases are a. enol cytosine and imino adenine b. keto guanine and enol adenine c. imino thymine and enol cytosine d. keto thymine and enol guanine e. enol thymine and amino xanthine
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