Capsid' of HIV is formed by.

Options

A. P-24
B. lipoprotein
C. P-17
D. both (1) and (3)

Answer

To answer the question "Capsid' of HIV is formed by," we can follow these steps:

### Step-by-Step Solution:

1. **Understanding HIV Structure**:
- The Human Immunodeficiency Virus (HIV) has a spherical structure with a diameter of approximately 90 to 120 nanometers.

2. **Identifying the Genetic Material**:
- The genome of HIV consists of two identical molecules of single-stranded RNA. This RNA is associated with the enzyme reverse transcriptase, which is crucial for converting RNA into DNA during the infection process.

3. **Examining the Envelope**:
- The HIV envelope is made up of a lipid bilayer that is derived from the host cell's membrane. This envelope contains glycoprotein spikes, which are important for the virus's ability to infect host cells.

4. **Defining the Capsid**:
- The capsid is the protein coat that encases the viral genome. In HIV, there are two layers of protein coats:
- The outer protein coat is formed by a protein known as p17.
- The inner protein coat is formed by a protein known as p24.

5. **Choosing the Correct Answer**:
- The question asks what the capsid of HIV is formed by. Since the capsid consists of both p17 and p24 proteins, the correct answer would be the option that includes both of these proteins.

### Conclusion:
The capsid of HIV is formed by proteins p17 and p24.