AP BIOLOGY

Detailed explanation-1: -Diffusion, a type of passive transport, is the movement of molecules from an area of higher concentration to an area of lower concentration. This difference in concentration from one area to another is called a concentration gradient.

Detailed explanation-2: -A concentration gradient occurs when the concentration of particles is higher in one area than another. In passive transport, particles will diffuse down a concentration gradient, from areas of higher concentration to areas of lower concentration, until they are evenly spaced.

Detailed explanation-3: -The difference in the concentrations of the molecules in the two areas is called the concentration gradient.

Detailed explanation-4: -The gradient is the slope of one particular point of a concentration profile. In linear concentration profiles, the gradient (slope) is identical at all positions, whereas the absolute concentration changes. When there are no concentration differences, the gradient is 0.

Detailed explanation-5: -Osmosis occurs until the concentration gradient of water goes to zero or until the hydrostatic pressure of the water balances the osmotic pressure. Osmosis occurs when there is a concentration gradient of a solute within a solution, but the membrane does not allow diffusion of the solute.