Multiple Choice
Which of the following are types of intercellular junctions found in animal cells?
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5. Cell Components
Cell Junctions
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Which of the following statements correctly matches a cell junction with its function?
A
Desmosomes facilitate the direct exchange of ions and small molecules between cells.
B
Tight junctions prevent the passage of molecules between adjacent cells.
C
Gap junctions anchor cells to the extracellular matrix.
D
Plasmodesmata create impermeable barriers between plant cells.
Verified step by step guidance1
Step 1: Understand the function of each type of cell junction mentioned in the problem. Cell junctions are specialized structures that connect cells to each other or to the extracellular matrix, and each type has a distinct role.
Step 2: Review the function of desmosomes. Desmosomes are anchoring junctions that provide mechanical strength by connecting the cytoskeletons of adjacent cells. They do not facilitate the direct exchange of ions or small molecules.
Step 3: Examine the function of tight junctions. Tight junctions create a seal between adjacent cells, preventing the passage of molecules and ions through the space between cells. This matches the statement: 'Tight junctions prevent the passage of molecules between adjacent cells.'
Step 4: Analyze the function of gap junctions. Gap junctions allow direct communication between cells by forming channels that enable the exchange of ions and small molecules. They do not anchor cells to the extracellular matrix.
Step 5: Investigate plasmodesmata in plant cells. Plasmodesmata are channels that traverse the cell walls of plant cells, allowing the exchange of materials between adjacent cells. They do not create impermeable barriers.
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