Among the options provided, E. coli is the example of a bacterium.
BACTERIA:
- Pathogens are organisms that cause diseases in other organisms. Pathogenic microorganisms include the following: virus, bacteria, fungi etc.
- Bacteria are unicellular and prokaryotic cells in nature. Examples of bacteria cells are Escherichia coli, Vibrio cholerae, Salmonella typhii etc.
- HIV means human immunodeficiency virus, and as the name implies, it is a virus. Yeast, on the other hand, is a fungus.
- Therefore, among the options provided, E. coli is the example of a bacterium.
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