Name the various microbes that are devoid of cellular structure. Which one of them is made exclusively of protein, exclusively of nucleic acid and both [nucleic acid and protein].

Explanation

**Step-by-Step Solution:**

1. **Identify Microbes Devoid of Cellular Structure:**
- The primary microbes that lack a cellular structure are viruses, prions, and viroids.

2. **Classify Each Microbe Based on Composition:**
- **Viruses:** These are composed of genetic material (either DNA or RNA) surrounded by a protein coat known as a capsid. Importantly, a virus contains both nucleic acid and protein.
- **Prions:** These are infectious agents that are solely made up of protein. They do not contain any nucleic acid.
...