In E. coli, what is the function of DNA polymerase III?
A) to unwind the DNA helix during replication
B) to seal together the broken ends of DNA strands
C) to add nucleotides to the 3' end of a growing DNA strand
D) to degrade damaged DNA molecules

Question

Quizplus · Accepted Answer

DNA polymerase III is responsible for adding nucleotides to the 3' end of the newly formed DNA strand during replication. It is the main enzyme involved in DNA synthesis in E. coli.

Option A is incorrect because helicase unwinds the DNA helix during replication. 
Option B is incorrect because DNA ligase seals together the broken ends of DNA strands. 
Option D is incorrect because damaged DNA molecules are degraded by DNA repair enzymes.

In E Coli, What Is the Function of DNA Polymerase III