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The Fundamental Unit of Life — Science STD 9 — Question

CBSE BoardEnglish MediumSTD 9ScienceThe Fundamental Unit of Life1 Mark
MCQ
The nucleus has:
  • A
    One membrane with pores.
  • B
    Two membranes with pores.
  • C
    Two membranes with pores through which substances do not pass.
  • D
    Two membranes with pores through which macromolecules may pass.
✓

Answer

  1. Two membranes with pores through which macromolecules may pass.

Explanation:

The nuclear membrane is made up of two membranes surrounded by a perinuclear space. Nuclear envelope has a large number or pores with a diameter of 200-800 angstroms. Nuclear pores have diaphragms, septa annuli, microspores for movement of substances between nucleus and cytoplasm.

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