which of the following describes the origins of these two components? the t7 polymerase has two main components: the polymerase proper, which is an 80-kd protein with both polymerase and exonuclease activity, and thioredoxin, a processivity factor that anchors the dna template for long periods of dna synthesis. which of the following describes the origins of these two components? the polymerase proper is encoded in the phage genome, whereas the processivity factor is encoded in the host (e. coli) genome. the polymerase proper is encoded in the host genome (e. coli), whereas the processivity factor is encoded in the phage genome. both components are encoded in the host (e. coli) genome. both components are encoded in the phage genome.
