1. Plasma membrane proteins that are "free to move in a sea of lipid" move

a) in the lipid-rich environment of the extracellular matrix

b) through the cytosol of the cell

c) through the membrane (from the IF to the cytosol or vice versa)

d) "laterally" around the surface of the cell

e) from the ER to the Golgi to the secretory vesicles to the plasma membrane

2. Diffusion occurs when

a) a moving fluid transports a particle

b) a population of particles spread out to fill a container

c) the potential energy of a concentration gradient of particle powers the net transport of the particle down its concentration gradient

d) an individual particle moves down its concentration gradient

e) there is net transport of a particle down its concentration gradient.

3) Which of the following concerning water in a cell is true?

a) Water freely moves in and out of a cell through the phospholipid bilayer by simple diffusion

b) The water is moving around with an average speed of about 1300 mph the water forms long-lived bonds with each other and solutes in the water.

c) The polarity in the water molecules repels hydrophobic molecules with a repulsion force.

d) The water can be thought as a Gel (like jello) with little cavities in it (like Swiss cheese). Each cavity contains a solute.