A Microbiologist Performs a Genetic Experiment in Which Cultures of Escherichia

A microbiologist performs a genetic experiment in which cultures of Escherichia coli are treated with a chemical that induces a high frequency of mutations.  Individual bacterial colonies are isolated to identify a mutant strain that lacks a specific enzyme involved in DNA replication.  This specific enzyme is responsible for removing short fragments of RNA that are base paired to the DNA template.  Which of the following enzymes is most likely deficient in this strain of E coli?

A) DNA polymerase I
B) DNA polymerase III
C) Gyrase
D) Helicase
E) Ligase
F) Primase

Correct Answer:

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