Pre Quiz 4

The movement of water molecules from a region of high free water concentration to a region of low free water concentration is known as ____________________.

Osmosis

What will happen when a red blood cell is placed in distilled water?

Lysis will occur

Tonicity is the measure of what?

Osmotic presssure

Which of the following molecules can diffuse through a cell membrane? Mark all that apply.

Small molecules

What factors determine how fast water moves across a membrane? Select all that apply.

Solute concentration difference. Hydrostatic pressure.

What will happen when a red blood cell is placed in a hypertonic solution?

The cell becomes shriveled

T/F Moving molecules against their concentration gradient requires energy.

True

T/F Plant cells are like red blood cells and can potentially burst when placed in solutions of varying tonicity.

false

T/F Simple diffusion requires energy input.

false

The difference between dialysis tubing and real cell membranes is that

real membranes are more selective