INTRODUCTION TO MICROSCOPY CELL BIOLOGY
CYTOSKELETON
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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They allow inorganic ions and small water-soluble molecules to move directly between cells.
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They allow ATP-driven pumps to move substances from one cell to another
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They allow an electrical and a metabolic coupling between the cells. They may be opened or closed as needed.
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None of the above
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Detailed explanation-1: -Gap junctions also provide “biochemical coupling, ‘’ which permits cell-to-cell movement of ATP (or other high-energy phosphates), cyclic nucleotides, and IP3, the activator of the IP3-sensitive SR Ca2+-release channel.
Detailed explanation-2: -Gap junctions permit the travel of small molecules back and forth between adjacent cells. Gap junctions form channels that are comprised of connexin proteins. Gap junctions prevent molecules and ions from traveling between cells in the extracellular space.
Detailed explanation-3: -Inorganic molecules as well as numerous metabolites, such as amino acids and sugars, can pass through these channels. However, macromolecules, such as proteins and nucleic acids, cannot move across.