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Which one of the following organisms is not an example of eukaryotic cells?
A
$Amoeba\ proteus$
B
$Paramecium\ caudatum$
C
$Escherichia\ coli$
D
$Euglena\ viridis$
Detailed Solution
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.
$Amoeba\ proteus$, $Paramecium\ caudatum$ 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.