DNA Structure and Replication

ID #1785

Where do we find circular or linear chromosomes?

The genomes of prokaryotes are typically found in circular form. The nuclear genomes of eukaryotes are typically found in linear form. But there are places in a eukaryotic cell other than the nucleus where you can find DNA. Mitochondria and chloroplasts, for example. And in these organelles, the DNA is found in circular form. This might be initially surprising, but when you consider that mitochondria and chloroplasts are believed to have orginated from ancestral prokaryotes (which would have had their own circular genomes at the time) which got engulfed by a larger cell, it actually makes perfect sense.

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