What does nucleoplasm mean?
Nucleoplasm is the fluid or gel-like material that fills the nucleus of a eukaryotic cell. It surrounds the chromatin, including the DNA and associated proteins, and is distinct from the nucleolus, the compact nuclear structure responsible for producing ribosomal subunits. The nucleoplasm is involved in nuclear activities such as transcription, regulation, and the movement of molecules into and out of the nucleus. Together with the nuclear envelope, it forms the nuclear environment in which genetic information is processed. Although the term is mainly used in cell and molecular biology, it can also appear in discussions of nuclear structure and disease. Understanding the distinction between nucleoplasm and cytoplasm helps describe the cell as a compartmentalized system, with specialized chemical environments supporting different biological functions.
nounThe fluid or gel-like substance filling the nucleus of a cell, excluding the nucleolus and the condensed chromatin structures. It contains dissolved substances involved in nuclear processes such as transcription and ribosome-subunit assembly.
- The fluid or gel-like material within the nucleus of a cell, surrounding the chromatin and nucleolus.
"The genetic information stored in the chromatin is suspended within the nucleoplasm, where transcription takes place."
"Proteins move between the nucleoplasm and the surrounding cytoplasm through the nuclear envelope."
"The nucleoplasm provides the environment in which many DNA-processing reactions take place."
The plural is rare because nucleoplasm is normally used as a mass noun.
"The diagrams compare the nucleoplasms of several types of cells."
The nucleoplasm is the cell nucleus's liquid workspace: it surrounds the chromatin and nucleolus, helping organize the machinery that reads DNA.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of nucleoplasm
The word was formed in the early 20th century from the combining form nucleo-, derived from Latin nucleus, meaning a kernel or nut, and the combining form -plasm, ultimately from Greek plasma, meaning something formed or molded. The term follows the established biological distinction between cytoplasm and nucleoplasm. Its related forms, including nuclear and nucleolus, share the Latin nuclear root, while plasma and cytoplasm belong to the same Greek-derived family of words referring to cellular substance.
Related word forms
How nucleoplasm is actually used
This is primarily a formal scientific term, especially common in cell biology, molecular biology, and histology. It is usually treated as a singular mass noun rather than as a countable biological structure.
Easily confused with nucleoplasm
Nucleoplasm is the fluid interior of the nucleus, whereas cytoplasm is the fluid portion surrounding the nucleus in the cell.
The nucleolus is a dense structure within the nucleoplasm involved in ribosome production, not the nucleoplasm itself.