9. Transport Across Membranes

In passive transport, what is the primary driving force for simple diffusion of a solute across a membrane?

Which of the following is the best definition of osmosis?

In osmosis across a semipermeable membrane, which direction does water move?

Crenation (shriveling) of an animal cell such as a red blood cell takes place when the cell is placed in which type of solution?

In passive transport, how does increasing a cell membrane’s surface area (while keeping the concentration gradient and membrane permeability constant) affect the rate of diffusion across the membrane?

Which statement best describes the difference between diffusion and osmosis in passive transport across membranes?

In osmosis, water moves across a selectively permeable membrane from an area of which condition to an area of which condition?

During osmosis in cells, what must water pass through as it moves from an area of lower solute concentration to an area of higher solute concentration?

In a hypotonic environment (too much water outside the cell), what is the most likely outcome for an animal cell due to osmosis?

Which scenario is the best model of diffusion (passive movement of particles down their concentration gradient)?

In the context of passive transport across a cell membrane, what is the key difference between simple diffusion and facilitated diffusion?

How does increasing diffusion distance affect the rate of diffusion across a membrane (all else being equal)?

In many freshwater protists, which organelle helps prevent the cell from swelling and bursting by collecting and pumping excess water out of the cell?

In the context of passive transport, what process allows water to move across a selectively permeable cell membrane?

In passive transport, diffusion causes molecules to move in which direction?