In E. coli, though DNA polymerase I Pol I plays an essential role in the replication process, it is not the major polymerase. Instead, the enzyme responsible for advancement of replication fork is Pol III. From the four DNA structures A, B, C and D given below, students made several interpretations about the shorter arm being extended by Pol I and/or Pol III.
Which one of the interpretation written below is correct?
1
A will be extended by Pol III but not by Pol I.
2
Neither B nor C will be extended by either Pol I or Pol III.
3
C will be extended by both Pol I and Pol III
4
D will be extended only by Pol I, but not by Pol III.