You Are Studying DNA Replication Using a Strain of Yeast

question 43

Multiple Choice

You are studying DNA replication using a strain of yeast whose DNA polymerase is reported to have an error rate of 10^-6 bases per cell cycle.However,your analyses of DNA sequences after DNA replication indicate that the error rate is closer to 10^-10.What may explain your results?

• A) The yeast expresses high levels of DNA ligase.
• B) The yeast has a mismatch repair system.
• C) RNA polymerase has high fidelity.
• D) The DNA polymerase can tolerate high temperatures.
• E) The DNA polymerase is processive.

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