Question

Which one of the following organisms is not an example of eukaryotic cells?

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

Answer 1

The correct option is C

Escherichia coli

The correct option is C.

The explanation for the correct option:

1. E. coli is a bacterium that thrives in both healthy people's and animals' intestines.
2. This bacterium is usually non-harmful. It aids in the digestion of foods.
3. Certain E. coli strains, on the other hand, might produce symptoms such as diarrhea, stomach aches and cramps, and a low-grade fever.

The explanation for the incorrect options:

Option A:

1. The phylum Ciliophora includes the unicellular protist Paramecium caudatum.
2. They can grow up to 0.33 mm in length and are covered in cilia, which are tiny hair-like organelles.
3. Cilia help in movement and nutrition.
4. In marine, brackish, and freshwater settings, the species is exceedingly numerous and ubiquitous.

Option B:

1. Euglena gracilis has been utilized extensively as a model organism in the laboratory.
2. Most Euglena species include photosynthesizing chloroplasts within the cell body, allowing them to eat by autotrophy, just like plants.
3. However, they can also take nourishment heterotrophically, like animals.

Option D:

1. Proteus is a membrane-bound organelle that stores the majority of a cell's genetic information and regulates the amoeba's behavior.
2. It takes an essential part in the reproduction of the cell

Final answer: Escherichia coli is not an example of eukaryotic cells.