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Cell-to-cell communication (gap junctions, plasmodesmata) Knowledge-Based Practice

Biology · Cell Communication & the Cell Cycle · Biology · Cell Communication

1 Biology practice questions on Cell-to-cell communication (gap junctions, plasmodesmata). Questions that assess core concepts and understanding.

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  1. 1.

    Which of the following structural characteristics distinguishes plasmodesmata in plant tissues from gap junctions in animal tissues?

    • A) Gap junctions allow the direct passage of cytoplasmic ions, whereas plasmodesmata prevent the movement of all small water-soluble solutes.
    • B) Plasmodesmata consist primarily of hexameric rings of connexin proteins that span an open extracellular space.
    • C) Plasmodesmata exhibit continuous plasma membranes between adjacent cells and contain an internal tubular extension of the endoplasmic reticulum.
    • D) Plasmodesmata facilitate intercellular communication exclusively by packaging signaling molecules into vesicles that undergo exocytosis.

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