What is the role of structural proteins?

Structural proteins play a crucial role in the formation and maintenance of various tissues and cells within an organism. They are essential components of the cellular architecture, providing support and shape to cells, tissues, and organs. Key examples of structural proteins include collagen, which is found in connective tissues, and keratin, which is a major component of hair, nails, and the outer layer of skin.

These proteins contribute to the overall physical structure of the body, allowing it to maintain its integrity and function properly. Additionally, they are vital in the processes of growth, repair, and maintenance of tissues, making them indispensable for the organism's overall health and functionality.

Other options, while important roles in biological systems—such as defending against pathogens (immune proteins), providing enzymatic activity (enzymes), and storing and transporting minerals (transport proteins)—do not pertain directly to the primary role of structural proteins.