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 DNA code in each of the strands is the same, but inverted, so that the sequence is identical when read in the 5' to 3' direction. This is the direction in which all DNA is polymerized, and also the direction in which a DNA sequence is read when written out, by convention.