E. coli polymerases I, II, and III have 3' to 5' activity, which provides them with a proofreading function, i.e. they can remove a mispaired base.

The proofreading activity, to maintain the fidelity of DNA synthesis,Group of answer choicesis a function of the 3'→5' exonuclease activity of DNA polymerasesis a function of the 5'→3' exonuclease activity of DNA polymerase IIIoccurs only when the DNA polymerase on the lagging strand encounters the previously synthesised fragmentoccurs after the DNA replication process has been completed

E.coli DNA polymerase III acts on:Group of answer choicesBoth leading and lagging strands of the replication forkThe lagging strand onlyNeither the leading nor lagging strandThe leading strand only

Proofreading activity to maintain the fidelity of DNA synthesis:Select one:a. Requires the presence of an enzyme separate from the DNA polymeraseb. Occurs in prokaryotes but not in eukaryotesc. Occurs after the synthesis has been completed

Which is true of the 5' - 3' exonuclease activity of DNA polymerase I?Group of answer choicesIt proofreads the DNA replication process of polymerase IIt can remove RNA primers via hydrolysis of their phosphodiester backbone linkages.It proofreads the DNA replication process of polymerase IIIIt is involved in synthesis of Okazaki fragments on the lagging strand.

Which activity of DNA polymerase I is its 'proofreading' activityGroup of answer choices5' to 3' exonuclease activityDNA polymerase I doesn't have this activityBoth 5' to 3' and 3' to 5' exonuclease activities3' to 5' exonuclease activity