Name the fluid contained inside the nucleus.

The fluid contained inside the nucleus is called nucleoplasm (also known as nuclear sap or karyoplasm).
Detailed Explanation:
1. Definition:
Nucleoplasm is the gel-like, viscous fluid that fills the interior of the nucleus, surrounding the nucleolus and chromatin.
2. Composition:
Nucleoplasm is composed of:
o Water (major component)
o Ions (e.g., potassium, sodium, calcium)
o Dissolved molecules such as nucleotides, enzymes, proteins, and RNAs
o Chromatin material (DNA and histone proteins)
o The nucleolus, which synthesizes ribosomal RNA.
3. Functions:
o Acts as a medium for the movement and transport of materials, such as ions, enzymes, and nucleotides, within the nucleus.
o Provides a suspension environment for nuclear components like chromatin and the nucleolus.
o Facilitates important nuclear activities such as DNA replication, transcription, and the assembly of ribosomal subunits in the nucleolus.
4. Location:
The nucleoplasm is enclosed within the nuclear membrane (nuclear envelope), separating it from the cytoplasm.
The nucleoplasm is the fluid contained inside the nucleus, serving as a medium for the essential processes occurring within the nucleus.