Which of the following microbe is made up of protein only?

Options

A. Virus
B. Baceria
C. Viroids
D. Prions

Answer

To determine which microbe is made up of protein only, we can analyze the options provided:

1. **Viruses**:
- Viruses consist of genetic material (either DNA or RNA) surrounded by a protein coat known as a capsid.
- Therefore, viruses are not made up of protein only.

2. **Bacteria**:
- Bacteria are prokaryotic organisms that contain both DNA and proteins.
- They also have plasmids, which are small DNA molecules.
- Hence, bacteria cannot be classified as being made up of protein only.

3. **Viroids**:
- Viroids are composed solely of RNA and do not have any protein coating.
- Thus, viroids are also not made up of protein.

4. **Prions**:
- Prions are infectious agents that are composed entirely of protein.
- They do not contain any nucleic acids (DNA or RNA) and are known to cause diseases.
- Therefore, prions are the only microbes made up of protein only.

Based on the analysis, the answer is **prions**.