experiments with cultured pea roots were conducted to determine ( i ) whether extrachromosomal dna was produced by cells in the late s phase or in the g2 phase of the cell cycle , ( ii ) whether the maturation of nascent dna replicated by these cells achieved chromosomal size , ( iii ) when extrachromosomal dna was removed from the chromosomal duplex , and ( iv ) the replication of nascent chains by the extrachromosomal dna after its release from the chromosomal duplex .
C0012854
dna
C0598312
replication