What is a nuclear pore and what is the function of a nuclear pore

Nuclear pores. The nuclear membrane is the boundary membrane between the nucleus and the cytoplasm, but the nuclear membrane is not connected and has many small pores, which is called nuclear pore.

It is the conduit for most of the exchange of substances between the nucleus and the cytoplasm, such as messenger RNA may enter the cytoplasm through the nuclear pore. The number of nuclear pores also varies according to the cell type and metabolic status, and there are few nuclear pore trees in cells with low or no transcriptional activity.

There are various names such as nuclear membrane pores, pores (pore), or annulus. It is a special structure located on the nuclear membrane of eukaryotes with a diameter of 70-150 nm. In the center of the nuclear pore there is a particle with a high electron density, surrounded by a film with a low electron density, and around the film there are eight particles with a high electron density.

The density of the nuclear pores on the surface of the nuclear membrane, as well as the inner and outer diameters of the nuclear pores, can vary depending on the type of organism and the stage of the cell. In general, the density of nuclear pores is related to the activity of the nucleus, and the higher the synthetic activity of the nucleus, the greater the density of the nuclear pores. Originally, biologists named the nuclear pore as a fine pore, but in fact it is not a simple pore that is always open, but selectively transmits material.

For example, a protein molecule with a diameter of only 10 nanometers cannot enter the nucleus from the cytoplasm. In addition, the nuclear pore is not completely impenetrable to large particles, and it has been observed that large particles containing RNA can enter the cytoplasm through the nuclear pore from the nucleus.

Nuclear pores are many small pores in the nuclear membrane that serve as channels for the exchange of substances between the nucleus and the cytoplasm.

Here's another picture

It's the hole in the nucleus.

Co-RNA inconsistencies.

The nuclear pore is the channel through which most of the material is exchanged between the nucleus and the cytoplasm, such as messenger RNA may enter the cytoplasm through the nuclear pore. The number of nuclear pores also varies according to the cell type and metabolic status, and the number of nuclear pores is low in cells with low transcriptional activity or no transcription.

Structurally, the nuclear pore complex is mainly composed of proteins; Functionally, the nuclear pore complex can be regarded as a special transmembrane transport protein complex of Duan's and a bifunctional and bidirectional hydrophilic nucleoplasmic exchange channel.

The pores of the lead nuclear membrane of different organisms have the same structure and exist in the form of a nuclear pore complex. Its inner and outer diameters are about 70 80 nm, and the diameter of the channel is about 9 nm. There are 8 symmetrically arranged globular particles with a diameter of about 15 nm around the periphery of the inner and outer orifices of the nuclear membrane. **There is also a central particle, about 30 nm in diameter.

There are filaments attached between the central particles and the spherical particles.

These filaments have the properties of ribonucleoproteins. There are also some amorphous materials in the pore channels of the nuclear membrane. The number, distribution and density of nuclear membrane pores are related to the metabolic activity of cells, and the number of nuclear membrane pores is large in the site where the exchange of substances between nucleoplasm and cytoplasm is vigorous.

It can be seen that the nuclear membrane pore plays a certain role in regulating the exchange of substances between the nucleus and the cytoplasm.

The role is to achieve frequent material exchange and information exchange between nucleoplasms

The nuclear pore is the channel through which most of the material is exchanged between the nucleus and the cytoplasm, such as messenger RNA can enter the cytoplasm through the nuclear pore. The number of nuclear pore disorders also varies depending on the cell type and metabolic status.

Small molecules, such as water, penetrate into the nucleus through the nuclear membrane.

What is the nuclear membrane and nuclear pore in a cell.

The nuclear envelope is a structure of a double membrane where the nuclear pores are located on the nuclear membrane and only macromolecular substances are allowed to pass through.

The role is to achieve frequent material exchange and information exchange between nucleoplasms

The nuclear pore is the channel through which most of the material is exchanged between the nucleus and the cytoplasm, such as messenger RNA may enter the cytoplasm through the nuclear pore. The number of nuclear pores also varies depending on the cell type and metabolic status.

Small molecules, such as water, penetrate into the nucleus through the nuclear membrane.

It is a complex made up of proteins, etc.

Nuclear pore complex: a complex tunnel structure that communicates nucleoplasm and cytoplasm on the nuclear envelope, and is composed of a variety of nucleoporins. There are particles composed of ribonucleoprotein digging in the inner and outer mouths of the tunnel, which have a controlling effect on the substances entering and leaving the nucleus.

Answer: d. Oral epithelial cells.

Analysis: The number of cavity head nuclear pores is related to cell metabolism (protein synthesis in cells). The more vigorous the metabolism of the Wupi number, the more nuclear pores there are. Whereas, oral epithelial cells have the lowest metabolism and, therefore, the fewest nuclear pores.