The correct answer is option 2: Bacteria.

To understand why bacteria is not an example of a eukaryotic organism, let`s first define what eukaryotes are. Eukaryotes are organisms that have cells with a nucleus and other membrane-bound organelles. These organelles include mitochondria, Golgi apparatus, endoplasmic reticulum, and others.

Now, let`s look at the options provided.

Option 1: Yeast - Yeast is a type of fungus and is a eukaryotic organism. It has cells with a nucleus and other membrane-bound organelles.

Option 2: Bacteria - Bacteria are prokaryotic organisms. They do not have a nucleus or other membrane-bound organelles like mitochondria. Instead, their genetic material is found in a region called the nucleoid.

Option 3: Plant - Plants are eukaryotic organisms. They have cells with a nucleus and other membrane-bound organelles.

Option 4: Human being - Humans are eukaryotic organisms. Our cells have a nucleus and other membrane-bound organelles.

In conclusion, bacteria is not an example of a eukaryotic organism because it