AP BIOLOGY

Detailed explanation-1: -The sodium-potassium pump transports sodium out of and potassium into the cell in a repeating cycle of conformational (shape) changes. In each cycle, three sodium ions exit the cell, while two potassium ions enter.

Detailed explanation-2: -Examples of active transport include the transportation of sodium out of the cell and potassium into the cell by the sodium-potassium pump. Active transport often takes place in the internal lining of the small intestine.

Detailed explanation-3: -The sodium-potassium pump is an example of active transport because energy is required to move the sodium and potassium ions against the concentration gradient.

Detailed explanation-4: -Active transport always leads to accumulation of molecules are ions towards one side of the membrane. This mode of transportation in plants is carried out by membrane proteins and transports the substance from the lower concentration to higher concentration.

Detailed explanation-5: -The sodium-potassium pump is an example. of an active transport pump. It uses ATP to move three sodium (Na+) ions and two potassium (K+) ions to where they are already highly concentrated. Sodium ions move out of the cell and potassium ions move into the cell.