AP BIOLOGY

Detailed explanation-1: -Active transport requires energy for the process by transporting molecules against a concentration or electrochemical gradient.

Detailed explanation-2: -Movement Across a Membrane and Energy There are two major ways that molecules can be moved across a membrane, and the distinction has to do with whether or not cell energy is used. Passive mechanisms like diffusion use no energy, while active transport requires energy to get done.

Detailed explanation-3: -Active transport is used by cells to accumulate needed molecules such as glucose and amino acids. Active transport powered by adenosine triphosphate (ATP) is known as primary active transport. Transport that uses an electrochemical gradient is called secondary transport.

Detailed explanation-4: -Active transport uses energy in the form of ATP (adenosine triphosphate) that is produced by cellular respiration. In active transport, the particles move across a cell membrane from a lower concentration to a higher concentration.