Book : Cell Biology
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Posted by: CHELSEA
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Writer CHELSEA

Nucleoplasm

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Nucleoplasm, also called nuclear sap or karyoplasm, is the fluid usually found in the nucleus of eukaryotic cells. This fluid contains primarily water, dissolved ions, and a complex mixture of molecules. Its primary function is to act as a suspension medium for the organelles of the nucleus. Other functions include the maintenance of nuclear shape and structure, and the transportation of ions, molecules, and other substances important to cell metabolism and function. Nucleoplasm is made primarily of water, ions and a various mixture of other molecules. It is a fairly sticky liquid that is completely enclosed within the nuclear membrane. It serves as a suspension medium for all of the organelles inside the nucleus, and it also helps maintain the shape and structure of the nucleus. One other function is that it is responsible for the transport of materials that are vital to metabolism and cell function

There are many types of plasm contained within a eukaryotic cell. The protoplasm is all of the cell's contents. Cytoplasm includes all cell fluids and organelles within the cell membrane or wall, but outside the nucleus. Cytosol, a fluid similar to nucleoplasm in both function and composition, is the main component of cytoplasm, making up about 70% of the cell's total volume. A nuclear membrane around the cell's nucleus separates the nucleoplasmic fluid from the cytoplasm in the rest of the cell.

The highly viscous nucleoplasmic fluid suspends and protects the nucleolus. This organelle is composed of proteins and nucleic acids, and it is responsible for the transcription and assembly of ribosomal ribonucleic acid (rRNA), a type of RNA that works together with messenger ribonucleic acid (mRNA) and transfer ribonucleic acid (tRNA) to transform amino acids into proteins.

Function of the Nucleoplasm:

  • The nucleus of most cells contains a substance that suspends structures inside the nuclear membrane. Just like the cytoplasm found inside a cell, the nucleus contains nucleoplasm, also known as karyoplasm.
  • The nucleoplasm is a type of protoplasm that is made up mostly of water, a mixture of various molecules, and dissolved ions. It is completely enclosed within the nuclear membrane or nuclear envelope. It is a highly gelatinous, sticky liquid that supports the chromosomes and nucleoli. A soluble, fluid component of the nucleoplasm is called the nuclear hyaloplasm.
  • The main function of the nucleoplasm is to serve as a suspension substance for the organelles inside the nucleus. It also helps maintain the shape and structure of the nucleus, and plays an important role in the transportation of materials that are vital to cell metabolism and function.
  • Many substances such as nucleotides and enzymes are dissolved in the nucleoplasm. 



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