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.
The contribution does not impact the amount you can put into you 401k. The profit sharing contribution is a separate amount that is based on discretionary amounts the employer wants to put in the plan for the benefit of all the fulltime employees. It is allocated based on a percentage of salary. So you are fortunate.