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.
If your small business is a corporation, the 401k-Profit Sharing contribution is deducted as a business expense on either your Form 1120 or Form 1120-S Federal Corporation Income Tax Return. A 401k-Profit Sharing plan has significant income tax advantages; plus it forces you to save for your retirement.ou can establish your 401k-Profit Sharing plan through a financial institution such as a mutual fund company, a securities brokerage firm, a bank, or an insurance company. There are also 401k retirement plan specialists who can design and customize your retirement plan.