Which statement about gap junctions is true?
A) They generally occupy less than 5 percent of the area of the plasma membrane.
B) They permit metabolic cooperation among linked cells.
C) They occur only in plants.
D) They are made up of G proteins.
E) Their structure allows communication within a cell.

Question

Quizplus · Accepted Answer

Gap junctions are membrane channels made up of connexin proteins that link the cytoplasm of adjacent cells, permitting the exchange of ions, metabolites, and signaling molecules. This allows for metabolic cooperation among the linked cells. Option A is incorrect because gap junctions can occupy a significant portion of the membrane in some cells. Option C is incorrect because gap junctions occur in both animal and plant cells. Option D is incorrect because G proteins are not involved in the formation or function of gap junctions. Option E is incorrect because gap junctions allow communication between cells, not within a single cell.

Which Statement About Gap Junctions Is True