Multiple Choice
Which of the following statements correctly describes tight junctions in animal cells?
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5. Cell Components
Cell Junctions
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Which of the following best describes tight junctions in animal cells?
A
They anchor cells to the extracellular matrix using intermediate filaments.
B
They allow the direct exchange of ions and small molecules between neighboring cells.
C
They connect the actin cytoskeleton of one cell to that of another cell.
D
They form a seal that prevents the passage of molecules between adjacent cells.
Verified step by step guidance1
Step 1: Understand the concept of tight junctions. Tight junctions are specialized connections between adjacent animal cells that create a barrier to prevent the passage of molecules and ions through the space between cells.
Step 2: Compare tight junctions to other types of cell junctions. For example, desmosomes anchor cells to the extracellular matrix using intermediate filaments, and gap junctions allow the direct exchange of ions and small molecules between neighboring cells.
Step 3: Recognize the unique function of tight junctions. Tight junctions form a seal that ensures substances must pass through the cells themselves rather than between them, maintaining selective permeability and compartmentalization.
Step 4: Eliminate incorrect options based on the functions of other junctions. For instance, tight junctions do not connect the actin cytoskeleton of one cell to another; this is a function of adherens junctions.
Step 5: Confirm that the correct description of tight junctions is: 'They form a seal that prevents the passage of molecules between adjacent cells.' This aligns with their role in maintaining the integrity of tissues and controlling molecular movement.
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