The core is surrounded by a shell, which consists of two membranes. The nuclear membrane on the side facing the cytoplasm is covered with ribosomes, the inner membrane of the nucleus is smooth. The nuclear membrane is part of the cell’s membrane system. The outgrowths of the external nuclear membrane are connected to the channels of the endoplasmic reticulum, forming a single system of communicating channels. Between the nucleus and the cytoplasm, a constant exchange of substances is carried out.
Despite the active exchange between the nucleus and the cytoplasm, the nuclear membrane delimits the nuclear content from the cytoplasm, thereby providing differences in their chemical composition. This is necessary for the normal functioning of nuclear structures.
Chromatin and one or more nucleoli are located in the gel-like nuclear juice.
In a living cell, nuclear juice looks like a structureless mass filling the gaps between the structures of the nucleus. The composition of the nuclear juice includes various proteins (including most nuclear enzymes), free nucleotides, amino acids, as well as ribonucleic acids (RNA), which are then transported from the nucleus to the cytoplasm.
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