MCQ
The structure of nuclear membrane is suitable for:
- AOrganisation of spindle for nuclear division.
- BNucleocytoplasmic exchange of materials.
- CSeparation of chromosomes.
- DSynthesis of endoplasmic reticulum.
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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Phylum mollusca can be distinguished from other nonchordates by the presence of: