Cell Transport & Water potential

The movement of a solute across a membrane in the direction of its concentration gradient (from high concentration to low concentration).

The movement of water across a membrane in order to equalize solute concentration

When solute concentration is equal on both sides of a semi permeable membrane

The movement of a solute across a membrane in the direction of its concentration gradient that requires the use of membrane proteins to transverse the membrane

Movement of solute across a membrane against its concentration gradient. Process requires both energy and membrane proteins.

Water fearing- substances that don't dissolve in water

Water loving- substances that dissolve in water

If a cells  $\Psi p$ = 3 bars and its  $\Psi s$ = -4.5 bars, what is the resulting  $\Psi$  ?

• -7.5

• 7.5

• -1.5

• 1.5

A plant cell with a $\Psi s$  of -7.5 bars keeps a constant volume when immersed in an open-beaker solution that has a  $\Psi s$  of -4 bars.  What is the cells  $\Psi p$  ?

• -4

• -7.5

• -3.5

• 3.5

What is the $\Psi s$   of a 1.0M sugar solution at 22 $\degree$ C under standard atmospheric conditions?

• -24.5 bars

• 24.5 bars

• -2.45

• 2.45