As a result, per capita income in Northwest Arkansas has converged with the national average. As of 2012, income per capita in Northwest Arkansas was about $36,000, about $6,000 below the national average. After adjusting for the lower cost of living in the region, per capita income in Northwest Arkansas was at that time, in effect, $40,000, just $2,000 shy of the national average.
Protein channels are important to facilitate the transport of ions and other larger molecules across the plasma membrane.   Large molecules cannot just diffuse thorough the â¦ membrane. In addition, polar molecules cannot diffuse through the membrane since it would be energetically unfavorable for them to negotiate the hydrophobic interior of the plasma membrane. Therefore, protein channels are essential in membrane transport.
Integral membrane proteins are inserted into the membrane and most pass through the membrane. Portions of these transmembrane proteins are exposed on both sides of the membrane. Cell membrane proteins have a number of different functions. Structural proteins help to give the cell support and shape.