Which statement describes prokaryotic origins of replication?

• A. They Are Located at Telomeres
• B. They Occur at Multiple Locations
• C. They Consist of a Single Origin on the Circular Chromosome
• D. They Require Linear Chromosomes

Answer: (C)

Prokaryotic genomes are typically circular and start replication at a single origin of replication, called oriC. This origin is the specific site where initiator proteins (like DnaA) bind, unwind the DNA, and begin assembling the replication machinery. From there, replication proceeds bidirectionally, with two forks moving around the circle until they meet and the chromosome is copied. This one-origin, circular setup is how most bacteria organize replication.

Locating the origin at telomeres isn’t correct because telomeres are the protective ends of linear eukaryotic chromosomes, not features of the usual prokaryotic circular chromosome. The idea of multiple origins would conflict with the common prokaryotic design; multiple origins are a characteristic more associated with certain linear or larger genomes in other domains of life. Even though a few species may have linear chromosomes, the standard, broadly accurate description for prokaryotes is a single origin on a circular chromosome.