Exam 3: The Plasma Membrane and Membrane Potential

Which of the following is not a function of membrane proteins?

The rate of carrier-mediated transport is limited by

Which of the following substances is most likely to passively diffuse across the plasma membrane by dissolving in the membrane?

Fibronectin is the extracellular matrix component that provides tensile strength.

The two dark lines in the trilaminar appearance of the plasma membrane are believed to be caused by the preferential staining of the hydrophilic polar regions of the membrane constituents.

If red blood cells are placed in a(n) ____________________ solution, water enters causing them to swell.

How are simple diffusion and facilitate diffusion similar? Different? Use specific examples to explain.

Active transport is a kind of ____________________ transport.

Which decreases the rate of diffusion for a substance through a membrane?

Refer to the accompanying diagram to match the following ions with the statements below. Answers may be used more than once -Its charge tends to move sodium out of the cell.

If a typical body cell is placed in a 0.25% saline solution, the cell

Leak channels for ________ and _________ are important in the generation and maintenance of the resting membrane potential.

In the cyclic AMP second messenger system, binding of the first messenger to a surface receptor leads to activation of ____, which induces the conversion of intracellular ____ to cyclic AMP.

Indicate the various roles of the following ions: -cation in greatest concentration in the ICF

Indicate which constituent of the plasma membrane is responsible for performing the function in question by filling in the appropriate blank using the answer code below. -Serves as membrane-bound enzymes.

Because of the presence of tight junctions, passage of materials across an epithelial barrier must take place between the cells, not through them.

Cadherins are one kind of ____________________.

Indicate which constituent of the plasma membrane is responsible for performing the function in question by filling in the appropriate blank using the answer code below. -Forms channels through the membrane.

Anions are attracted toward a more positively charged area along an electrical gradient.

What aspect of the membrane prevents water soluble substances from crossing the membrane?