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For example, plasma membrane proteins carry out functions as diverse as ferrying nutrients across the plasma membrane, receiving chemical signals from outside the cell, translating chemical signals into intracellular action, and sometimes anchoring the cell in a particular location (Figure 4).
The proteins in a. membrane function in support, transport, recognition, and. reactions. Structure of Membrane Proteins. Membrane proteins are. anchored into the lipid bilayer by their nonpolar regions. 6.3 Passive transport across membranes moves down. the concentration gradient. Diffusion. Random molecular motion results in a net. movement of molecules to regions of lower concentration.