Which infectious particles lacks genetic material?

Options

A. Viroids
B. Virions
C. Prions
D. Virusoids

Answer

To answer the question "Which infectious particles lack genetic material?", we can follow these steps:

### Step 1: Understand the Options
First, we need to identify the different types of infectious particles mentioned in the video transcript: viroids, virions, prions, and virusoids.

### Step 2: Analyze Each Option
1. **Viroids**: These are infectious agents composed of a short strand of circular RNA. They do contain genetic material (RNA).

2. **Virions**: These are complete virus particles that consist of genetic material (either DNA or RNA) surrounded by a protein coat. Therefore, they also contain genetic material.

3. **Prions**: Prions are infectious proteins that lack nucleic acids (DNA or RNA). They are known to cause diseases by inducing abnormal folding of normal cellular proteins.

4. **Virusoids**: These are similar to viroids but are dependent on a helper virus for replication. They also contain genetic material (RNA).

### Step 3: Identify the Correct Answer
From the analysis, we see that prions are the only infectious particles among the options that do not contain any genetic material. Therefore, the correct answer is **prions**.

### Final Answer:
**Prions are the infectious particles that lack genetic material.**

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