BIOL 1001 Study Guide - Midterm Guide: Cell Membrane, Membrane Transport Protein, Facilitated Diffusion
Document Summary
Is the membrane at the boundary of every cell that acts as selective barrier thereby regulating the cell"s chemical environment. Membrane proteins: transport proteins a protein that regulates the movement of water soluble molecules through the plasma membrane, channel proteins pores. A membrane protein that forms a channel or pore completely through the membrane and that is usually permeable to one or to a few water-soluble molecules, especially ions: carrier proteins selective revolving doors. A membrane protein that facilitates the diffusion of specific substances across the membrane. Glycoproteins are proteins which have carbohydrate attached to them. Movement of molecules: requires two factors, movement must be through a fluid liquid or gas. Active transport: an energy-requiring process during which a transport protein pumps a molecule across a membrane against its concentration gradient, uses energy from atp, used to maintain ion gradients (e. g. , ca2+ ions)
