Prokaryotic organisms have a single origin of replication, whereas eukaryotic organisms have many origins where replication occurs simultaneously. which of the following is the most probable reason for this observation?
prokaryotes do not replicate their dna.
prokaryotic dna is single-stranded.
prokaryotic dna is much smaller than eukaryotic dna.
prokaryotic dna is replicated more slowly than eukaryotic dna.

Prokaryotic DNA is much smaller than eukaryotic DNA.

Explanation:

Origin of replication is the site on DNA where DNA replication can be started. Eukaryotes have a larger DNA than that of prokaryotes. The larger DNA size of eukaryotes poses the need of multiple origin of replications. DNA replication can begin simultaneously on these multiple origin of replication sites. This allows the larger eukaryotic DNA to get replicated quickly.

Smaller DNA of prokaryotes can be replicated with single origin of replication.

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these macromolecules could either be amino acids, proteins or nucleic acids. they are responsible for the chemical changes and reactions that affects largely the cell and its composition. take for instance the cytoplasm of the cell where these organelles are settled. these simple organelles are composed of macromolecules which ignites and catalyses different functions that enables cells, in macro-perspective in motion and metabolism. in intestines for example, metabolism happens and breaking down parts of a food to simpler compounds that are used and these nutrients delivered throughout the body and again broken down by into smaller components.