Indicate whether each of the following descriptions better applies to adherens junctions (A), desmosomes (D), gap junctions (G), or tight junctions (T). Your answer would be a four-letter string composed of letters A, D, G, and T only, e.g. AAAD.
( ) They play a direct role in structural polarization of epithelial cells.
( ) They couple cells both electrically and metabolically.
( ) They are formed from hexameric hemichannels that can assemble into heterotypic complexes.
( ) They create semipermeable paracellular pores.

Question

Indicate whether each of the following descriptions better applies to adherens junctions (A), desmosomes (D), gap junctions (G), or tight junctions (T). Your answer would be a four-letter string composed of letters A, D, G, and T only, e.g. AAAD.
( )	They play a direct role in structural polarization of epithelial cells.
( )	They couple cells both electrically and metabolically.
( )	They are formed from hexameric hemichannels that can assemble into heterotypic complexes.
( )	They create semipermeable paracellular pores.

Quizplus · Accepted Answer

Tight junctions form a fence between plasma membrane domains in a polarized cell, contributing to the difference in apical and basolateral surface proteins. They also form seals between cells in an epithelial sheet to confer particular permeability properties on the sheet. Gap Junctions, formed from aligned hexameric hemichannels on the plasma membranes of two neighboring cells, form molecular sieves that that allow the cells to share small molecules and ions.

Indicate Whether Each of the Following Descriptions Better Applies to Adherens