What term describes the sites where DNA replication initiates?

What term describes the sites where DNA replication initiates?

• A. Coding regions
• B. Origins of replication
• C. Telomeres
• D. Centromeres

Answer: (B)

Origins of replication are the sequences where DNA replication begins. At these sites, initiator proteins bind and unwind the DNA locally, allowing replication forks to form and the genome to be copied. In bacteria there is usually a single origin, while eukaryotic chromosomes have many origins to ensure the genome is replicated efficiently. This helps distinguish from coding regions, which are parts of genes that get transcribed into RNA; telomeres, the protective ends of chromosomes; and centromeres, the regions where spindle fibers attach during cell division.

Origins of replication are the sequences where DNA replication begins. At these sites, initiator proteins bind and unwind the DNA locally, allowing replication forks to form and the genome to be copied. In bacteria there is usually a single origin, while eukaryotic chromosomes have many origins to ensure the genome is replicated efficiently.

This helps distinguish from coding regions, which are parts of genes that get transcribed into RNA; telomeres, the protective ends of chromosomes; and centromeres, the regions where spindle fibers attach during cell division.