This video entertainingly supplements this 3d animation of DNA strand replication. Does this process happen serially from the beginning to the end of a DNA strand (like having to unzip a six foot long zipper - example A below) or does the strand get chopped up into chunks, unzipped individually, replicated then brought back together (example B)?
I suspect the answer is case A. If so, is any phase of replication done in a parallel fashion? I would think something has to be (since it happens so fast and serial anything is typically very slow in comparison).