Q170 / 180 · AIIMS 2016 · Zoology

Assertion : Gap junctions perform cementing function to keep the neighbouring cells together. Reason : Tight junctions facilitate the cells to communicate with each other by connecting the cytoplasm of adjoining cells, for rapid transfer of ions, small and big molecules, etc.

  • A
    If both assertion and reason are true and reason is the correct explanation of assertion.
  • B
    If both assertion and reason are true but reason is not the correct explanation of assertion.
  • C
    If assertion is true but reason is false.
  • Correct answer
    D
    If both assertion and reason are false.

Solution

Gap junctions are direct cytoplasm to cytoplasm connections between many kinds of animal cells, these are meant for chemical exchange between cells. Whereas tight junctions are the regions where membranes of adjacent animal cells are held close together by sealing strands. They lie cells firmly and check movement of materials between them.

Hence, the correct answer is option: 'D'.

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