Prokaryotic and eukaryotic cells

E. coli is a prokaryote and Chlamydomonas is a eukaryote.
They differ in ribosomes (70S vs 80S), chromosomal organisation (naked circular DNA vs chromosomes with histones) and cell wall (peptidoglycan vs cellulose).
The cell membrane is structurally similar in both: a lipid bilayer with proteins.

Eukaryotic cells have a membrane-bound nucleus and membrane-bound organelles; prokaryotic cells lack them.
$Amoeba\ proteus$, $Paramecium\ caudatum$ and $Euglena\ viridis$ are protists, which are unicellular eukaryotes.
$Escherichia\ coli$ is a bacterium (kingdom Monera): it has a nucleoid without a nuclear membrane, 70S ribosomes and no membrane-bound organelles.
Hence $Escherichia\ coli$ is not an example of eukaryotic cells.