11.11 Transport

What is osmosis?

• The movement of solutes from a region of higher concentration to a region of lower concentration.

• The movement of water molecules through a semi-permeable membrane from a region of lower solute concentration to a region of higher solute concentration.

• The active transport of ions across a membrane using energy.

• The movement of molecules against their concentration gradient using transport proteins.

Which statement is true about facilitated diffusion?

• It requires energy in the form of ATP.

• It moves substances against their concentration gradient.

• It involves the use of transport proteins.

• It is the same as active transport.

What is the main difference between osmosis and facilitated diffusion?

• Osmosis involves the movement of solutes, while facilitated diffusion involves the movement of water.

• Osmosis requires energy, while facilitated diffusion does not.

• Osmosis involves the movement of water, while facilitated diffusion involves the movement of solutes.

• Osmosis occurs only in plant cells, while facilitated diffusion occurs in animal cells.

Which of the following conditions is necessary for osmosis to occur?

• A concentration gradient of solutes.

• A semi-permeable membrane.

• The presence of transport proteins.

• The input of energy.

Facilitated diffusion is different from simple diffusion because:

• It requires energy.

• It involves the movement of water.

• It uses transport proteins to move substances across the membrane.

• It occurs only in plant cells.