Cadherins and integrins are 

Options

A. Intercellular
B. Transmembrane glycoproteins
C. Rivet-like adhesions
D. Intermediate filaments

Answer

### Step-by-Step Solution:

1. **Understanding Cadherins and Integrins**:
- Cadherins and integrins are types of adhesion molecules that play crucial roles in cell adhesion.
- They are both transmembrane proteins, meaning they span the cell membrane.

2. **Function of Integrins**:
- Integrins primarily mediate the adhesion between cells and the extracellular matrix (ECM).
- They are involved in signaling pathways that affect cell behavior and are essential for processes like cell migration and tissue repair.

3. **Function of Cadherins**:
- Cadherins are responsible for homotypic adhesion, which means they facilitate adhesion between similar cells (cell-to-cell adhesion).
- They are critical for maintaining the structure and integrity of tissues.

4. **Classification of Cadherins and Integrins**:
- Both cadherins and integrins are classified as adhesion receptors.
- They are not classified as intermediate filaments, which are part of the cytoskeleton and provide structural support to cells.

5. **Conclusion**:
- Cadherins and integrins are indeed adhesion molecules that function in cell adhesion, but they have different roles and mechanisms.
- They can be described as "rivet-like" due to their function in holding cells together, but they are not intermediate filaments.

### Final Answer:
Cadherins and integrins are adhesion receptors that mediate cell adhesion, with integrins primarily facilitating adhesion to the extracellular matrix and cadherins mediating cell-to-cell adhesion.

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