MGA2 04-04

Schematic Diagram of DNA synthesis & replication

    The old strands separate, and new bases are added to either strand according to the base pairing rules. Bases are added only at the 3' end: the 5' end remains unmodified. That is, extension (synthesis) on either strand occurs only in the 5'3' direction. Duplication of both strands (replication) involves extension processes on both strands, running in opposite directions with respect to the replication fork.

Figure ©2004 Griffiths et al.; all text material ©2015 by Steven M. Carr