Cell Transport Review

• Name two functions of the cell membrane.

– Regulate what enters/exits the cell– Provides support

• What is the purpose of cholesterol?

– Keeps the phospholipids from sticking together– Keeps membrane flexible

• A phospholipid contains a phosphate head that is best described as

• - non-polar and hydrophobic• - non-polar and hydrophilic• - polar and hydrophilic• - polar and hydrophobic

• If a solution is isotonic, what will water molecules do?

• Move equally throughout the solution

• How do phospholipids arrange themselves within the membrane?

• In a double layer with the phosphate heads facing outward and the lipid tails on the inside

• A phospholipid contains two fatty acids tails that are best described as– polar and hydrophilic.– polar and hydrophobic.– non-polar and hydrophilic.– non-polar and hydrophobic.

• Carbohydrates serve what purpose for the cell membrane?

• Define selectively permeable.

• Define concentration gradient.

• What are 2 similarities between endo and exocytosis?

• If I’m going down the concentration gradient, I’m going……

• Name the 1st type of passive transport and define it.

• Name the 2nd type of passive transport and define it.

• Name the 3rd type of passive transport and define it

• What would happen to an animal cell with an internal salt concentration of 15% if it were placed in a salt solution with a concentration of 0.8%?

• Potato cells are approximately 99% water and 1% salt. What would happen to a potato cell if it was put into 30% salt solution?

• In which osmotic solution is a plant in a turgid or normal state?

• What is the difference between passive and active transport?

• How are facilitated diffusion and active transport similar?

• If I’m going against the concentration gradient, I’m going……

• What is exocytosis?

• Define dynamic equilibrium.

• What is endocytosis?

• How does a protein pump different than a protein channel?