diffusion, osmosis, Osmolarity, Tonicty

Question 1

Diffusion across a Plasma membrane can be

Answer 1

simple or channel mediated

Question 2

Materials that diffuse through plasma membrane by simple diffusion include

Answer 2

–Lipid-soluble compounds (alcohols, fatty acids, and steroids)
–Dissolved gases (oxygen and carbon dioxide)

Question 3

Compouds that use channel mediated diffusion

Answer 3

Water soluble compounds and ions because hydrophilic will not easily pass

Question 4

Factors in channel mediated diffusion

Answer 4

size
charge
Interaction with the channel

Question 5

Lipid soluble: diffuse or doesn;t diffuse

Answer 5

Diffuse through the plasma membrane

Question 6

Large molecules that cannot diffuse through lipids cannot cross the plasma membrane unless they are transported by a

Answer 6

carrier mechanism

Question 7

Small water-soluble molecules and ions diffuse through

Answer 7

membrane channels

Question 8

The diffusion of water across the cell membrane

Answer 8

osmosis

Question 9

▪More solute molecules, lower concentration of water molecules
▪Membrane must be freely permeable to water, selectively permeable to
solutes

Answer 9

Osmosis

Question 10

Water molecules diffuse across membrane toward solution with more
solutes
▪Volume increases on the side with more solutes

Answer 10

osmosis