Question at position 47 Which is a description of desmosomes?channels that perforate plant walls, allowing water and solutes to passcommunicating junctions that provide cytoplasmic channels between adjacent cellsreceptors for extracellular matrix proteinsanchoring junctions that fasten cells together into strong sheetsmembranes of neighboring cells are pressed together to prevent fluid leakage

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BlackTom AI · Accepted Answer

To tackle this question, I’ll map each option to the type of cell junction it describes and see which one aligns with desmosomes.
Option 1 suggests 'channels that perforate plant walls, allowing water and solutes to pass.' This is describing plasmodesmata in plants, which are cytoplasmic channels through cell walls, not desmosomes in animal tissues. So this is incorrect for desmosomes.
Option 2 states 'communicating junctions that provide cytoplasmic channels between adjacent cells.' That wording points to gap junctions, which permit direct chemical and electrical communication between neighboring animal cells. Desmosomes don’t form cytoplasmic channels, so this option is incorrect.
Option 3 describes 'receptors for extracellular matrix proteins.' Those receptors are often integrins associated with the focal adhesion complex and hemidesmosomes, but this phrasing doesn’t fit desmosomes either. Therefore, this option is incorrect.
Option 4 reads 'anchoring junctions that fasten cells together into strong sheets.' This matches the classic definition of desmosomes, which are cadherin-based anchoring junctions that connect intermediate filaments to strengthen tissue integrity. This option is correct.
Option 5 says 'membranes of neighboring cells are pressed together to prevent fluid leakage.' That describes tight junctions, which seal space between cells rather than anchoring them. Hence, this option is incorrect.
Overall, options 1, 2, 3, and 5 misidentify the junction type, while option 4 correctly identifies desmosomes as anchoring junctions that bind cells into strong sheets.

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