12.4 Each eukaryotic UNIDIRECTIONAL REPLICATION chromosome contains many replicons BIDIRECTIONAL REPLICATION Figure 12.5 Different densities of radioactive labeling can be used to distinguish Heavy density label unidirectional and Light density label bidirectional replication Not labeled (invisible on autoradiograph) 消当Figure 12.5 Different densities of radioactive labeling can be used to distinguish unidirectional and bidirectional replication. 12.4 Each eukaryotic chromosome contains many replicons