The movement of substances from lower to higher concentration across a semipermeable membrane that must have a specific protein carrier and cell expenditure of energy is called
A)facilitated diffusion.
B)diffusion.
C)active transport.
D)osmosis.
E)endocytosis.

Question

Quizplus · Accepted Answer

Active transport is the movement of substances from lower to higher concentration across a semipermeable membrane that must have a specific protein carrier and cell expenditure of energy. This process requires a significant amount of energy in the form of ATP (adenosine triphosphate). Facilitated diffusion (choice A) is similar to passive diffusion, but the movement of the substance across the membrane is facilitated by a specific protein channel or carrier. Diffusion (choice B) is the movement of molecules from an area of higher concentration to an area of lower concentration, without the need for a protein carrier or energy expenditure. Osmosis (choice D) is the diffusion of water across a semipermeable membrane from an area of high water concentration to an area of low water concentration. Endocytosis (choice E) is the process of bringing molecules or particles into the cell by engulfing them with the cell membrane.

The Movement of Substances from Lower to Higher Concentration Across