What is the role of transport proteins within the plasma membrane?

Question

Quizplus · Accepted Answer

Transport proteins are responsible for facilitating the movement of ions and polar molecules through the hydrophobic lipid bilayer of the plasma membrane, which would otherwise be impermeable to these substances. They help maintain the concentration gradients of molecules required for various cellular processes such as metabolism, replication and signaling. Examples include channels and carriers for specific ions and proteins that selectively recognize and bind to certain molecules for transport across the membrane.

What Is the Role of Transport Proteins Within the Plasma