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#nuclear pores

4 public questions tagged with this topic.

Cell Organelles

The primary function of nuclear pores is:

Nuclear envelope is perforated by two thousand to four thousand pores per mammalian nucleus, each one hundred twenty nanometers diameter channel composed of nucleoporins forming selective barrier separating nuclear and cytoplasmic compartments. Central channel filled with phenylalanine-glycine repeat containing disordered domains forms hydrogel allowing passive diffusion of ions and molecules under about forty kDa, but macromolecules bearing nuclear localization signals require binding to importin alpha-beta heterodimers and transit via transient interaction with FG repeats powered by Ran-GTP

Ref: Wente Genes Dev; NPC 120nm FG nucleoporins regulated transport Ran-GTP importin exportin.

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Endomembrane System - ER Golgi Lysosome Vacuole

A double-membrane structure separates nuclear contents from the cytoplasm. Its outer membrane is continuous with the end

The nuclear envelope forms a barrier between the nucleus and cytoplasm. Its outer membrane is continuous with ER and may bear ribosomes. Fusion of its two membranes forms nuclear pores through which RNA and proteins move in both directions.

Ref: NCERT Class 11 Biology Chapter 8: Cell: The Unit of Life Endomembrane System - ER Golgi Lysosome Vacuole

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Eukaryotic Cell - Cell Wall and Cell Membrane - Fluid Mosaic Model

A substance blocks every nuclear pore without damaging the nuclear envelope itself. Which effect would follow most direc

Nuclear pores are passages formed where the two nuclear-envelope membranes fuse. RNA and protein molecules move through them in both directions between the nucleus and cytoplasm, so blocking the pores would directly obstruct this exchange.

Ref: NCERT Class 11 Biology Chapter 8: Cell: The Unit of Life Eukaryotic Cell - Cell Wall and Cell Membrane - Fluid Mosaic Model

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