Final answer:
The structure that creates an impermeable seal between two cells is the tight junction, which relies on proteins called claudins and occludins to prevent materials from leaking between cells. These junctions are crucial in tissues that require a barrier function, such as the epithelium of internal organs.Option B is the correct answer.
Step-by-step explanation:
The structure that seals the space between two cells and makes it impermeable is called tight junctions.
Tight junctions are a type of cell-cell adhesion in animal tissue that forms watertight seals between adjacent cells. They are made up of proteins, predominantly claudins and occludins, which tightly hold cells together, preventing materials from leaking between the cells. These junctions are especially important in epithelial tissues that line internal organs and cavities, such as those lining the urinary bladder, to ensure that substances don't pass between the cells into the extracellular space.
On the other hand, desmosomes are intercellular 'rivets' that provide strong mechanical attachments between cells but do not seal the space to prevent fluid passage. Therefore, the correct answer to the question is b) Tight junctions.
Tight junctions stand out as crucial cellular structures forming impermeable barriers between adjacent cells, particularly vital in animal tissues, notably epithelial tissues lining organs and cavities. Comprising proteins like claudins and occludins, these junctions create watertight seals, preventing the leakage of materials between cells. Their significance is evident in tissues like the urinary bladder lining, ensuring strict control over substance passage. In contrast, desmosomes serve as robust intercellular rivets, providing mechanical strength without forming impermeable seals. The distinction highlights the specialized roles of tight junctions in maintaining tissue integrity by sealing intercellular spaces, emphasizing their specific functional contribution in cellular adhesion.