In some cases, a municipality will go from a fractional level of assessment to 100 percent. If the original level of assessment was 10 percent, and the current level of assessment is 100 percent, your assessed value could go from $9,000 to $90,000, and you might not see any increase in taxes.f the original level of assessment was 10 percent, and the current level of assessment is 100 percent, your assessed value could go from $9,000 to $90,000, and you might not see any increase in taxes.
The cell membrane is selectively permeable, meaning it only lets certain things in and out of the cell. If you think about our building analogy, this can be a very important thing. You wouldn't want just anyone running in and out of the White House, for example.
The cell membrane's main trait is its selective permeability, which means that it allows some substances to cross it easily, but not others. Small molecules that are nonpolar (have no charge) can cross the membrane easily through diffusion, but ions (charged molecules) and larger molecules typically cannot. Nonpolar and small polar molecules can pass through the cell membrane, so they diffuse across it in response to concentration gradients. Carbon dioxide and oxygen are two molecules that undergo this simple diffusion through the membrane.