In contrast to bacteria, eukaryotic chromosomes need multiple DNA replication origins because:a$)$ eukaryotic chromosomes cannot usually replicate bidirectionally.b$)$ eukaryotic genomes are not usually circular, like the bacterial chromosome is$.$ c$)$ it would take too long with only a single origin per chromosome.d$)$ they have a variety of DNA polymerases for different purposes and need a corresponding variety of replication origins.e$)$ the processivity of the eukaryotic DNA polymerase is much less than the bacterial enzyme.