Hypernyms (to doodle is one way to...): draw (represent by making a drawing of, as with a pencil, chalk, etc. on a surface). Doodle entails doing...: delineate; describe; draw; line; trace (make a mark or lines on a surface).
DNA polymerases can only extend a DNA strand in a 5â² to 3â² direction, different mechanisms are used to copy the antiparallel strands of the double helix. In this way, the base on the old strand dictates which base appears on the new strand.
The leading strand's free end is a 3' end, and the end that's nearest to the replication fork is the 5' end. So, DNA polymerase can simply start at the free end, working in the 3' to 5' direction, and run continuously toward the replication fork.