Transport Mechanism

Passive transport operates independently of the concentrations of the moving solute.

Passive transport permits the solute to move in either direction, but the net movement of solute molecules occurs down the concentration gradient of the molecule.

Passive transport operates independently of diffusion.

In passive transport, solute movement stops when the solute concentration is the same on both sides of the membrane.

It is a passive process.

It occurs when molecules move from a region of lower concentration to a region of higher concentration.

It involves only the movement of water molecules.

It requires expenditure of energy by the cell.

The added salt makes the solution hypotonic compared to the cell. Water will enter the cell by osmosis.

The added salt would enter the cell, causing the cell to take up water and swell.

Water would enter the cell by osmosis, and the cell would swell.

Water would leave the cell by osmosis, causing the volume of the cytoplasm to decrease.

The red blood cell would burst, and the plant cell would shrink.

The red blood cell would shrink, and the plant cell would gain water.

Both cells would lose water; the red blood cell would shrivel, and the plant plasma membrane would pull away from the cell wall.

Both cells would gain water by osmosis; the red blood cell would burst, and the plant cell would increase in turgor pressure.

Active transport requires energy from ATP, and facilitated diffusion does not.

Active transport involves transport proteins, and facilitated diffusion does not.

Facilitated diffusion involves transport proteins, and active transport does not.

Facilitated diffusion can move solutes against a concentration gradient, and active transport cannot.

pinocytosis: the uptake of water and small solutes into the cell by formation of vesicles at the plasma membrane

exocytosis: the movement of water and solutes out of the cell by passage through the plasma membrane

phagocytosis: secretion of large particles from the cell by fusion of vesicles with the plasma membrane

osmosis: passive diffusion of water and small solutes across a membrane