Multiple Choice
Which of the following is not a type of cell adhesion molecules?
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18. Cell Junctions and Tissues
Cell-Cell Adhesion
Multiple Choice
Which class of cell-surface molecules is most directly involved in cell-to-cell recognition by displaying diverse extracellular carbohydrate patterns (e.g., ABO blood group antigens)?
A
Ribosomal RNA within cytosolic ribosomes
B
Actin filaments of the cytoskeleton
C
Glycoproteins and glycolipids (cell-surface glycocalyx)
D
Gap junction connexins forming intercellular channels
Verified step by step guidance1
Understand that cell-to-cell recognition often involves molecules on the cell surface that can present diverse carbohydrate structures to other cells.
Recall that the glycocalyx is a carbohydrate-rich zone on the cell surface composed mainly of glycoproteins and glycolipids, which carry various sugar chains.
Recognize that these carbohydrate patterns, such as those defining ABO blood group antigens, are attached to proteins or lipids on the plasma membrane, enabling specific cell recognition.
Eliminate options that do not directly participate in extracellular carbohydrate display: ribosomal RNA is intracellular and involved in protein synthesis; actin filaments are cytoskeletal components inside the cell; gap junction connexins form channels for communication but do not display carbohydrates externally.
Conclude that glycoproteins and glycolipids in the glycocalyx are the class of molecules most directly involved in cell-to-cell recognition through diverse extracellular carbohydrate patterns.
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