AP BIOLOGY

Detailed explanation-1: -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-2: -The difference in the concentration of a substance across a space is called a concentration [ equilibrium / gradient ]. Page 5. 4. If there is a concentration gradient, substances will move from an area of high concentration to an area of [ equal / low ] concentration.

Detailed explanation-3: -Diffusion is the net movement of molecules from an area where they are at a higher concentration to areas where they are at a lower concentration. This is due to the random movement of the molecules. The difference in the concentration of a substance between two areas is called the concentration gradient .

Detailed explanation-4: -The movement of molecules across a cell membrane against a concentration gradient is known as active transport. This means that the molecules are moving from an area of lower concentration to an area of higher concentration. To do this, they need energy.

Detailed explanation-5: -The concentration profile describes the distribution of concentration (e.g., of a specific compound) over a certain distance. The gradient is the slope of one particular point of a concentration profile.