Which one of the following organisms is not an example of eukaryotic cells?
Amoeba proteus
Paramecium caudatum
Escherichia coli
Euglena viridis
Amoeba proteus, Paramecium caudatum, Euglena viridis are unicellular eukaryotic organisms and belongs to the kingdom Protista. Escherichia coli is a prokaryotic organism and belongs to the kingdom of Monera. It does not have nucleus or other membrane-bound cell organelles like chloroplast and mitochondria.