Final answer:
Protein expression refers to the process of protein synthesis in organisms. Enzymes catalyze chemical reactions, while structural proteins provide support and strength to cells and tissues. Signaling proteins play a role in cellular communication.
Step-by-step explanation:
Protein expression refers to the process by which proteins are produced in an organism. It involves the synthesis of proteins from the information encoded in DNA through a process called protein synthesis. Enzymes, structural proteins, and signalling proteins are all types of proteins that perform different functions in the cell.
Enzymes are proteins that catalyze chemical reactions in the cell. They act as biological catalysts, increasing the rate of chemical reactions. For example, the enzyme amylase helps in the breakdown of starch into sugar.
Structural proteins provide support and strength to cells and tissues. They form the structural framework of various cell components. For example, collagen is a structural protein that provides strength to the connective tissues in our body.
Signalling proteins play a role in communication between cells. They transmit signals from one cell to another, coordinating various cellular processes. For example, insulin is a signalling protein that regulates blood sugar levels.