Structural proteins are essential components of living organisms, providing support and shape to cells and tissues. They form the building blocks of structures like muscles, skin, and bones. Common examples of structural proteins include collagen, which gives strength to connective tissues, and keratin, found in hair and nails. These proteins are crucial for maintaining the integrity and function of various biological structures. In addition to their supportive roles, structural proteins also play a part in cellular processes. They help cells maintain their shape and enable movement. For instance, actin and tubulin are structural proteins that form the cytoskeleton, allowing cells to move and divide properly.