Exam 4: Movement of Molecules Across Cell Membranes

Which is a form of cellular transport that involves the movement of molecules into cells without passing through the plasma membrane's structural matrix?

Active transport,facilitated diffusion and osmosis all directly require the expenditure of metabolic energy.

In the body,Na+ ions behave as if they are nonpenetrating solutes because they are actively transported out of cells.

What is the best description of a secondary active transport process that cotransports an amino acid with Na+?

Which of these is an example of a hypertonic solution?

In active transport,the affinity of any given binding site for the molecule to be transported changes as the site goes from facing one side of the membrane to facing the other side.

What will happen if a normal cell is placed in a hypotonic solution?

Specific proteins in the membranes mediate movement of lipid-soluble molecules into cells.

Mediated transport is required in order for glucose,amino acids,and fatty acids to pass into cells because none of these substances can diffuse through plasma membranes.

By what transport mechanism does glucose enter most cells?

The luminal side of an epithelial cell is also known as the basolateral side.

What will happen if a normal cell is placed in a hyperosmotic solution?

If the ATP-generating mechanisms in a cell are poisoned and the cell depletes its ATP reserves,which would occur first?

The Na/K ATPase pump is an enzyme that phosphorylates itself.

If pure water and a solution containing a nonpenetrating solute are separated by a membrane that is permeable only to water,what would occur?

"Osmosis" refers to the movement of what substance across semipermeable membranes?

At any given time it is possible to see endocytotic vesicles docked to intracellular organelles such as those which may receive their contents for modification,synthesis,packaging,and then release.Which organelle would be most likely to be involved in this process as a destination for a transport vesicle formed for this purpose along the plasma membrane?

The final equilibrium state reached by a molecule that enters a cell by facilitated diffusion is the same as that for a molecule that enters the cell by diffusion.

What process lowers blood plasma levels of cholesterol-containing lipoproteins?

Most cells can perform pinocytosis,but only a few kinds can perform phagocytosis.