Final answer:
Eukaryotic organisms, such as certain yeasts, can contain plasmids such as the 2-micron plasmid in Saccharomyces cerevisiae. These extrachromosomal DNA elements play a role in conferring advantageous traits to the organism.
Step-by-step explanation:
While plasmids are more commonly associated with prokaryotic cells, particularly bacteria, they are rare but can indeed be found in eukaryotic organisms. One such instance of eukaryotes with plasmids is with certain types of yeast, such as Saccharomyces cerevisiae.
In these yeast cells, the plasmid identified is known as the 2-micron plasmid. Plasmids are small, circular, double-stranded DNA molecules that serve as vectors in genetic engineering and can carry genes that give advantageous traits like antibiotic resistance. In eukaryotes, other types of extrachromosomal DNA exist such as those in the mitochondria and chloroplasts, having evolved from endosymbiotic relationships with ancestral prokaryotes.