The gelatinous liquid in the nucleus of a cell is called nucleoplasm or karyoplasm. It is a type of protoplasm found only in the nuclear membrane. Its contents differ from the cytoplasm contained between the cell membrane and nuclear membrane.
Nucleoplasm is made up primarily of water. Nucleotides, enzymes, and a variety of dissolved organic molecules and ions make up the remainder. The cellular chromosomes and nucleolus float freely in the nuceloplasm, which functionally provides a structured shape to the nuclear membrane. The fluid, soluble component of nucleoplasm is called the nuclear hyaloplasm. Plasmas such as nucleoplasm and cytoplasm generally exist in a liquid sol state or a jelly-like gel state.