Virus envelope is known as

Options

A. Core
B. Capsid
C. virion state
D. Nucleoprotein

Answer

To answer the question "Virus envelope is known as," we need to analyze the options provided and understand the structure of a virus.

### Step-by-Step Solution:

1. **Understanding Virus Structure**:
- A virus typically consists of a core of genetic material (either DNA or RNA) surrounded by a protective protein coat called a capsid. Some viruses also have an outer lipid envelope.

2. **Identifying the Options**:
- The options given are: core, capsid, viron state, or nucleoprotein.

3. **Analyzing Each Option**:
- **Core**: This term usually refers to the innermost part of the virus, which contains the genetic material. It is not synonymous with the envelope.
- **Capsid**: This is the protein shell that encases the viral genome. It is not the envelope either.
- **Viron State**: This term refers to the complete virus particle that is capable of infecting a host. It does not specifically denote the envelope.
- **Nucleoprotein**: This term refers to the complex of nucleic acids and proteins. It does not describe the envelope.

4. **Correct Answer**:
- The virus envelope is often referred to as a "proteinaceous capsid." However, it is important to note that the envelope itself is distinct from the capsid, as it is made of lipids and proteins derived from the host cell membrane. The correct term for the envelope is not explicitly listed in the options, but based on the context, the closest association would be with the capsid.

### Conclusion:
The virus envelope is often associated with the capsid, but it is important to clarify that the envelope itself is a lipid layer that surrounds the capsid in some viruses.