Repetitive sequences are stretches of $DNA$ with repeated bases many times in a genome, but

$(a)$ These sequences are of no transcriptional function
$(b)$ These are associated with euchromatin region
$(c)$ These helps to identify a person on the basis of its $DNA$ specificity

Mode of $DNA$ replication in E. coli is

The prokaryotic genetic system contains

Chromosomes were seen first time by