The subunit of capsid is called-

Options

A. Core
B. Nucleotide
C. Amino acid
D. Capsomere

Answer

To answer the question "The subunit of capsid is called-", we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Structure of Viruses**:
- Viruses are composed of genetic material (either DNA or RNA) surrounded by a protective protein coat known as the capsid.

2. **Defining the Capsid**:
- The capsid is the outer layer of a virus that encases and protects the viral nucleic acid. It is made up of multiple protein subunits.

3. **Identifying the Subunits of the Capsid**:
- The individual protein subunits that make up the capsid are referred to as "capsomers."

4. **Choosing the Correct Option**:
- Among the provided options:
- Option 1: Core (incorrect, as it refers to the nucleic acid part)
- Option 2: Nucleotide (incorrect, as it refers to the building blocks of nucleic acids)
- Option 3: Amino Acid (incorrect, as these are the building blocks of proteins)
- Option 4: Capsamer (correct, as it refers to the subunit of the capsid)

5. **Final Answer**:
- The subunit of the capsid is called **Capsamer** (Option 4).