Which of the following statements about DNA polymerase III holoenzyme from E. co

Question

Which of the following statements about DNA polymerase III holoenzyme from E. coli are correct?
A)   It elongates a growing DNA chain hundreds of times faster than does DNA polymerase I
B)    It associates with the parental template, adds a few nucleotides to the growing chain, and then dissociates before initiating another synthesis cycle.
C)   It maintains a high fidelity of replication, in part, by acting in conjunction with a subunit containing a 3’ ? 5’ exonuclease activity.
D)   When replicating DNA, it is a molecular assembly composed of at least 10 different kinds of subunits

Explanation / Answer

I believe the correct answer to be :

C)   It maintains a high fidelity of replication, in part, by acting in conjunction with a subunit containing a 3’ - 5’ exonuclease activity.

It is the ? subunit that has this activity and is present in a holoenzyme.

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