A culture of an organism believed to cause intestinal symptoms is viewed under the microscope, and the microbiologist observes a cell membrane, flagella, mitochondria, and some dark unrecognizable structures within each cell.The microbiologist notes that the cells are eukaryotic because

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Mitochondria are found only in eukaryotic cells, specifically in the cytoplasm of most eukaryotic cells. Therefore, the presence of mitochondria in the observed cells indicates that they are eukaryotic. The other characteristics mentioned (cell membrane, flagella, and nuclei) are also found in some prokaryotic cells, so they cannot definitively determine whether the observed cells are eukaryotic or prokaryotic.

A Culture of an Organism Believed to Cause Intestinal Symptoms