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The Fundamental Unit of Life — Science STD 9 — Question

Gujarat BoardEnglish MediumSTD 9ScienceThe Fundamental Unit of Life1 Mark
MCQ
Who showed that the nuclear membrane has many pores or circular structures or annuli:
  • A
    Fawcell
  • B
    Strasburger
  • C
    Butchen
  • ✓
    Callan and Tomlin
✓

Answer

Correct option: D.
Callan and Tomlin
The nucleus is surrounded by a double membrane bearing many pores. These pores are important for cytoplasm$-$nucleoplasm communication and exchange of materials. Nuclear pores have diaphragms, septa annuli, microspores for movement of substances between nucleus and cytoplasm. The nuclear pore complex was first described by Callan and Tomlin.

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