AP BIOLOGY

Detailed explanation-1: -The difference in the concentration of a substance between two areas is called the concentration gradient . The bigger the difference, the steeper the concentration gradient and the faster the molecules of a substance will diffuse. The direction of diffusion is said to be ‘down’ or ‘with’ the concentration gradient.

Detailed explanation-2: -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.

Detailed explanation-3: -In biology, a difference in concentration is referred to as a concentration gradient. Concentration gradients are important because they help us predict which way molecules will move according to diffusion.

Detailed explanation-4: -Moving against a concentration gradient means that the substance is moving from a low concentration to a high concentration. Moving down (descending) a concentration gradient means that the substance is moving from high concentration area to a low concentration area.

Detailed explanation-5: -Concentration gradient refers to the gradual change in the concentration of solutes in a solution as a function of distance through a solution. A solution, essentially, has two major components, the solvent (the dissolving component, e.g. water) and the solute (the particles that are dissolvable by the solvent).