Question

Which of the following is NOT a Cell Adhesion molecule?

• A. Selectin
• B. Integrins
• C. Cadherins
• D. Tubulins

Answer 1

The Correct Option is D

Cell adhesion molecules (CAMs) are specialized proteins that facilitate cell-cell and cell-extracellular matrix (ECM) interactions. These molecules play critical roles in tissue formation, immune responses, and cellular signaling. 

Step 1: Understanding Cell Adhesion Molecules - Selectins, Integrins, and Cadherins are all classified as cell adhesion molecules. - They help cells adhere to each other or to the extracellular matrix. 

Step 2: Evaluating the Options - Option (A) - Incorrect: Selectins mediate transient cell-cell adhesion in the immune system. - Option (B) - Incorrect: Integrins facilitate cell-ECM interactions. - Option (C) - Incorrect: Cadherins mediate calcium-dependent cell-cell adhesion. - Option (D) - Correct: Tubulins are structural proteins that form microtubules, not adhesion molecules. 

Step 3: Conclusion Since Tubulins are part of the cytoskeleton and not involved in adhesion, the correct answer is option (D).