Question

Which one of the following organisms is not an eukaryote?

• A. Paramecium caudatum
• B. Escherichia coli
• C. Euglena viridis
• D. Amoeba proteus

Answer 1

The correct option is B Escherichia coli

Eukaryotes are the organisms which have membrane-bound cell organelles as well as membrane-bound nucleus. All the kingdoms except kingdom monera possess eukaryotes.

Paramecium caudatum and Amoeba proteus are the protozoans belonging to kingdom Protista. So, they are eukaryotes.

Euglena viridis also belongs to kingdom Protista. It is a protistan algae.

Escherichia coli is not a eukaryote. It is a gram -ve bacteria belonging to kingdom Monera. Monera is a kingdom of prokaryotes. They do not have membrane-bound organelles and an organised nucleus.