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.
Facilitated diffusion and active transport are two membrane transport mechanisms involved in the passage of molecules across the plasma membrane. Both facilitated diffusion and active transport use transmembrane proteins to transport molecules.