Smallest cell // organism is that of

Options

A. Vibrio
B. Bacillus
C. Mycoplasma
D. Rhizobium.

Answer

To determine the smallest cell or organism among the given options, we can analyze the size of each organism listed:

1. **Vibrio**: This refers to a genus of bacteria that are typically rod-shaped. The size of Vibrio cells ranges from approximately 2 to 3 micrometers in length.

2. **Bacillus**: This is another genus of bacteria, which can vary in size from about 1 to 4 micrometers.

3. **Mycoplasma**: Mycoplasma species are known to be the smallest living organisms. They are prokaryotes and can be as small as approximately 0.2 micrometers in size, making them the smallest among the options provided.

4. **Rhizobium**: This is a genus of bacteria that is commonly known for its symbiotic relationship with legumes. The size of Rhizobium cells typically ranges from 1 to 3 micrometers.

After analyzing the sizes of these organisms, we can conclude that:

- **Mycoplasma** is the smallest organism listed, with sizes around 0.2 micrometers.

Thus, the answer to the question "Smallest cell/organism is that of" is **Mycoplasma**.