6.In E. coli, DNA polymerase I does not have which of the following activity?
(A) 5' to 3' polymerase activity
(B) 3' to 5' polymerase activity
(C) 5' to 3' exonuclease activity
(D) 3' to 5' exonuclease activity.

題目解析本題考察的是大腸桿菌（E. ...