AP BIOLOGY

Detailed explanation-1: -During active transport, substances move against the concentration gradient, from an area of low concentration to an area of high concentration. This process is “active” because it requires the use of energy (usually in the form of ATP). It is the opposite of passive transport.

Detailed explanation-2: -Active transport is a kind of cellular transport where substances move against a concentration gradient. This means that the direction is from an area of lower concentration to an area of higher concentration.

Detailed explanation-3: -Concentration gradient refers to the change that occurs when molecules diffuse across the membrane. Basically, the concentration of two molecules differs from both sides of the membrane. The cell is often trying to reach the concentration gradient to an equilibrium state.

Detailed explanation-4: -Answer and Explanation: Active transport is able to move a solute (such as ions or molecules) against its concentration gradient. Active transport is accomplished by the use of transport proteins that use ATP to move solutes from areas of low concentration to high concentration.