Multiple Choice
Which statement best explains why a guard cell and a storage parenchyma cell are different from each other?
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5. Cell Components
Cell Junctions
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Which type of cell junction is primarily responsible for preventing the passage of molecules between adjacent animal cells?
A
Plasmodesmata
B
Gap junctions
C
Desmosomes
D
Tight junctions
Verified step by step guidance1
Understand the function of each type of cell junction mentioned in the problem: Plasmodesmata, Gap junctions, Desmosomes, and Tight junctions.
Plasmodesmata are found in plant cells and allow the transport of molecules and ions between adjacent cells. Since the question is about animal cells, this option can be excluded.
Gap junctions are specialized connections between animal cells that allow the direct exchange of ions and small molecules, facilitating communication. They do not prevent the passage of molecules, so this option can also be excluded.
Desmosomes are anchoring junctions that provide mechanical strength by holding adjacent cells together, but they do not prevent the passage of molecules. This option can be excluded as well.
Tight junctions are the correct answer because they form a seal between adjacent animal cells, preventing the passage of molecules and ions through the space between cells. This is their primary function.
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