The cytoplasm (cell fluid) is viscous, and any internal structure
that it might have in terms of barriers or compartments is obscured
by densely packed ribosomes, although some scientists believe that
compartments do exist.
The fluid is a 20% protein solution in water, containing ions and
small molecules and serving as a pool or reservoir for the small
metabolites of the cell.
It contains the enzymes for all cell processes other than respiration
and the light reactions of photosynthesis.
These processes include glycolysis, glucose synthesis, various other
syntheses, and DNA replication and transcription.