A research scientist purifies DNA polymerase Ill from Escheric | USMLE Biochemistry Videos & Books

A research scientist purifies DNA polymerase Ill from Escherichia coli extract. When the enzyme is incubated in a mixture containing DNA templates, RNA primer oligonucleotides, and tagged deoxynucleotides, she finds that the enzyme possesses 3' to 5' exonuclease activity.