Answer
Living cells are made primarily of proteins, and proteins are indispensable in the most important cellular functions ; Some cells like muscles, cartilage, skin, are specially important in giving organisms form and in these connections the proteins myosin, collagen, andreticum and keratin are serve important functions. They are not only vital for formation and growth but also for maintenance and repair of cells an tissues. The physiological and metabolic functions of proteins are many: they function as hormones, enzymes ,receptors, signalling molecules, transporters, and antibodies.
Work Step by Step
Synthesis and hydrolysis reactions are vital in the energy economy of cells. The enzyme that catalyses synthesis of ATP, and facilitates its hydrolysis ( ATP synthase and N/K ATPase , respectively) are necessary to make available the large amount of energy required for eukaryotic life. Messenger and communication functions of the cell are served by proteins that make up protein hormones like luteinizing hormone ( LH), growth hormone and thyroxin.. Transport across membrane lipid bilayer is effected by transporter proteins ; proteins also function serve as membrane receptors ,cell identifiers and signallers ; moreover, produce protective bodies --antibodies-- to help ward of infection and injury to cells and tissues
