Diffusion Across a Cell Membrane. Diffusion is the movement of a substance across a membrane. Substances diffuse across cell membranes in a process known as passive transport. This means that the cell does not expend any energy in transporting substances across the cell membrane. Instead, substances move down their concentration gradient as a result of random thermal motion.
401k and profit sharing plans are both forms of retirement plans. They allow employees to make pre-tax contributions to an account where contributions and earnings are not taxed until distributed. Some 401k plans require an employer to make contributions to a plan.
EA, CFPÂ®, AIFÂ®, MBA. Profit sharing plans are a type of retirement plan. In a profit sharing plan, your employer contributes some of his/her money towards your retirement. Often times, profit sharing plans are linked with 401(k) plans. Unlike a Pension plan, profit sharing plan contributions are not mandatory, but must be substantial and recurring.