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The Fundamental Unit of Life — Science STD 9 — Question

CBSE BoardEnglish MediumSTD 9ScienceThe Fundamental Unit of Life1 Mark
MCQ
The structure of nuclear membrane is suitable for:
  • A
    Organisation of spindle for nuclear division.
  • B
    Nucleocytoplasmic exchange of materials.
  • C
    Separation of chromosomes.
  • D
    Synthesis of endoplasmic reticulum.
✓

Answer

  1. Organisation of spindle for nuclear division.

Explanation:

During the G2 phase of interphase, the nuclear membrane increases its surface area and doubles its number of nuclear pore complexes. In eukaryotes, such as yeast, which undergo closed mitosis, the nuclear membrane stays intact during cell division. The spindle fibers either form within the membrane, or penetrate it without tearing it apart. In other eukaryotes (animals as well as plants), the nuclear membrane must break down during the prometaphase stage of mitosis to allow the mitotic spindle fibers to access the chromosomes inside. The breakdown and reformation processes are not well understood.

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