The movement of substances from higher to lower concentration across a semipermeable membrane that must have a specific protein carrier but no energy expenditure is called
A)facilitated diffusion.
B)diffusion.
C)active transport.
D)osmosis.
E)endocytosis.

Question

Quizplus · Accepted Answer

Facilitated diffusion involves the movement of substances from higher to lower concentration across a semipermeable membrane with the help of specific protein carriers but no energy expenditure. Diffusion also involves the movement of substances from higher to lower concentration without the need for protein carriers. Active transport requires energy expenditure to move substances against their concentration gradient. Osmosis is the movement of water across a semipermeable membrane from an area of high water concentration to an area of low water concentration. Endocytosis involves the uptake of large molecules or particles by the cell through the membrane.

The Movement of Substances from Higher to Lower Concentration Across