Question

Which of the following is NOT typically found in the Escherichia coli origin of replication (oriC)? DnaA boxes ter sequences GATC sites Actually, all of the above are found in the oriC AT-rich region Nuclear matrix proteins binding to matrix attachment regions (MARs) help to form which level of eukaryotic chromosomal condensation? None of the above Beads on a string 3θnm fiber Radial loop domains

Answer 1

Ter sequences are NOT typically found in the oriC of E. coli. In eukaryotic chromosomal condensation, nuclear matrix proteins binding to MARs lead to the formation of radial loop domains, which are beyond the initial 'beads on a string' structure and 30 nm fiber.

Step-by-step explanation:

The components typically found in the Escherichia coli origin of replication (oriC) include DnaA boxes, GATC sites, an AT-rich region, and are not known to contain ter sequences. Thus, ter sequences are NOT typically found in oriC. Meanwhile, in eukaryotes, nuclear matrix proteins binding to matrix attachment regions (MARs) facilitate the formation of radial loop domains, one of the levels of chromosomal condensation.

These domains are a step in the hierarchical organization of chromatin, beyond the "beads on a string" structure and the 30 nm fiber. Radial loop domains, as well as the further-condensed metaphase chromosome, are seen during different stages of the cell cycle.