Exam 3: The Plasma Membrane and Membrane Potential

Indicate whether the force in question tends to move the involved ion in or out of the cell by filling in the blank using the following answer code. -Na⁺-K⁺ pump for K⁺

Indicate the various roles of the following ions: -ion that has the predominant influence on the resting membrane potential

Indicate whether the force in question tends to move the involved ion in or out of the cell by filling in the blank using the following answer code. -electrical gradient for K⁺ at resting potential

Diffusion results from

By osmosis, water always moves to an area of higher

Primary active transport moves which of the following ions across the membrane?

Facilitated diffusion requires energy expenditure.

Endocytosis and exocytosis are both kinds of ____________________ transport.

At resting potential, the outside of the cell is negative compared to the intracellular fluid.

The large protein anion does not leave the cell because it cannot easily cross the membrane.

MATCHING Match the term to the correct description. -Promotes cell adhesion.

Most of the membrane potential of the plasma membrane is established by the Na⁺-K⁺ pump.

Refer to the accompanying diagram to match the following ions with the statements below. Answers may be used more than once -Concentration gradient moves ion out of cell. 44. 25-30 times more permeable than sodium

Indicate whether the force in question tends to move the involved ion in or out of the cell by filling in the blank using the following answer code. -concentration gradient for K⁺ at resting potential

The head of a phospholipid molecule has a(n) ____________________ charge.

OTHER The following seven questions are associated with the accompanying figure (above) of the plasma membrane. -Which structure performs a variety of functions?

Cations are attracted to a more positively charged area along an electrical gradient.

The large, negatively charged intracellular proteins (A^-) cannot permeate the cell membrane because

If two similar molecules can both combine with the same carrier, the presence of one of these molecules decreases the rate of entry of the other.

The following questions refer to comparative concentrations, permeabilities, and potentials under various circumstances. Indicate the relationship between the two items listed in each situation by following answer code. -A. concentration of A? in the extracellular fluid B. concentration of A? in the intracellular fluid of a resting nerve cell