Which of the following statements about gap junctions is true?
A) They generally occupy less than 5 percent of the area of the plasma membrane.
B) They are specialized structures that permit metabolic cooperation among the linked cells.
C) They occur only in plants.
D) They are made of G proteins.
E) All of the above

Question

Quizplus · Accepted Answer

Gap junctions are specialized structures that allow for metabolic cooperation among the cells they link. They are particularly important for the coordinated activity of cells in tissues such as the heart and smooth muscle. They are not restricted to plants, and they occupy a considerable amount of the area of the plasma membrane (up to 20 percent, depending on the cell type). They are not made of G proteins.

Which of the Following Statements About Gap Junctions Is True