Which domain of organisms uses one origin of replication?

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Study for the DNA Replication and DNA Storage Test. Use flashcards and multiple choice questions, each with hints and explanations. Prepare for your exam with confidence!

Multiple Choice

Which domain of organisms uses one origin of replication?

Explanation:
The main idea here is how the genome’s layout dictates where DNA replication starts. Prokaryotes typically have a circular chromosome with a single origin of replication. Replication begins at that one site and proceeds bidirectionally around the circle until the entire genome is copied. In contrast, eukaryotic genomes are linear and much larger, so they use multiple origins of replication along each chromosome to replicate efficiently within the cell cycle. Because prokaryotes rely on a single origin for their circular genomes, this domain is the one that uses one origin of replication.

The main idea here is how the genome’s layout dictates where DNA replication starts. Prokaryotes typically have a circular chromosome with a single origin of replication. Replication begins at that one site and proceeds bidirectionally around the circle until the entire genome is copied. In contrast, eukaryotic genomes are linear and much larger, so they use multiple origins of replication along each chromosome to replicate efficiently within the cell cycle. Because prokaryotes rely on a single origin for their circular genomes, this domain is the one that uses one origin of replication.

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