Why does E.coli need both DNA polymerase III and DNA polymerase I?
A)DNA polymerase III lacks the 5' → 3' exonuclease activity needed to remove RNA primers.
B)Each polymerase is specific for only one strand of DNA.DNA polymerase III acts only on the leading strand,and DNA polymerase I acts only on the lagging strand.
C)DNA polymerase I is needed to join the Okazaki fragments.
D)The DNA replication is bidirectional;one polymerase is used for each direction.
E)Only DNA polymerase I has proofreading ability.

Question

Quizplus · Accepted Answer

DNA polymerase III synthesizes the new DNA strand but lacks the 5' → 3' exonuclease activity needed to remove RNA primers, which is provided by DNA polymerase I.

Why Does E