AP BIOLOGY

Detailed explanation-1: -Active transport is the movement of molecules (ions, glucose, and amino acids) across the membrane against the concentration gradient. It requires cellular energy in the form of ATP. The protein molecules embedded within the membrane act as channels through which molecules can pass.

Detailed explanation-2: -Active transport is the process by which dissolved molecules move across a cell membrane from a lower to a higher concentration. In active transport, particles move against the concentration gradient-and therefore require an input of energy from the cell.

Detailed explanation-3: -In the active transport, substances (e.g. ions, glucose, and amino acids) move across a membrane from a region of their lower concentration to a region of their higher concentration. Thus, they move against the direction of their concentration gradient.

Detailed explanation-4: -Diffusion is an important process in human physiology. Specifically, diffusion is the mechanism of movement of oxygen, nutrients and other molecules across the capillary walls and the movement of other molecules across membranes.

Detailed explanation-5: -Active transport is the movement of dissolved molecules into or out of a cell through the cell membrane, from a region of lower concentration to a region of higher concentration. The particles move against the concentration gradient, using energy released during respiration .