Antibody molecule is Y shaped. The two tips of this Y shaped molecule bind to antigen through which type of
interaction /bond ?

Options

A. Non-covalent interaction
B. Disulfide bonds
C. Covalent interaction
D. Peptide bond

Answer

To solve the question regarding the type of interaction or bond through which the tips of the Y-shaped antibody molecule bind to an antigen, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Structure of Antibodies**:
- Antibodies are Y-shaped molecules composed of two heavy chains and two light chains. The tips of the Y are known as the antigen-binding sites.

2. **Identifying the Interaction Type**:
- The question specifically asks about the type of interaction that occurs between the antibody and the antigen at these binding sites.

3. **Evaluating the Options**:
- The options provided are:
- Non-covalent interaction
- Disulphide bond
- Covalent interaction
- Peptide bond

4. **Analyzing Each Option**:
- **Non-covalent interaction**: This includes various types of weak interactions such as hydrogen bonds, ionic bonds, and van der Waals forces, which are typically involved in antigen-antibody binding.
- **Disulphide bond**: This is a strong covalent bond that occurs within the antibody structure itself, connecting different chains, but not between the antibody and antigen.
- **Covalent interaction**: This is a strong bond that involves sharing electrons, which is not the primary interaction in antigen-antibody binding.
- **Peptide bond**: This is a specific type of covalent bond that links amino acids in proteins, not relevant to the binding of antibodies to antigens.

5. **Conclusion**:
- The correct answer is **non-covalent interaction**, as this is the type of interaction that allows antibodies to bind to antigens effectively and reversibly.

### Final Answer:
The tips of the Y-shaped antibody molecule bind to the antigen through **non-covalent interactions**.