Final answer:
The jelly-like substance between the nucleus and the cell membrane is called the cytoplasm. It is composed of a gel-like material called cytosol. The cytoplasm fills the interior of cells and contains various organelles.
Step-by-step explanation:
The jelly-like substance between the nucleus and the cell membrane is called the cytoplasm. The cytoplasm is composed of a gel-like material called cytosol, which is made up of water and other molecules including enzymes. It fills the interior of cells and contains various organelles.