* Enzymes: Catalyze (speed up) biochemical reactions within the cell.
* Structural components: Provide shape and support to cells, tissues, and organs.
* Transport and storage: Move molecules across membranes or store important substances.
* Signaling and communication: Act as messengers and receptors, transmitting information within and between cells.
* Defense and immunity: Help the body fight off infections and maintain immune function.
* Regulation and control: Regulate gene expression, cell cycle progression, and other cellular processes.
Therefore, proteins are multifunctional molecules with diverse roles in maintaining cell structure, function, and overall organismal health.
