Quality Assurance (QA) Associate Salary. Average Quality Assurance Associates in the United States make around $49K per year. Cash earnings for Quality Assurance Associates â including $5K in bonuses and $6K in profit sharing proceeds near the top of the pay scale â generally stretch from $27K to $67K depending on individual performance.
Facilitated diffusion is the flow of molecules down a concentration gradient, across a membrane, but requires the help of a protein. There are two categories of proteins that assist facilitated diffusion: carrier proteins and channel proteins. Carrier proteins are like taxi cabs in a cell membrane.
Simple diffusion allows non-polar molecules to pass through and a little amount of H20. On the other hand, Facilitated diffusion allows ions and polar molecules across the mem â¦ brane because it contains carrier proteins. It is highly specific to substances it diffuses across the membrane.acilitated Diffusion is the movement of molecules across cell membranes through protein channels and carrier proteins.