What is the term for the colorless material that makes up the living part of a cell?

The term for the colorless material that constitutes the living part of a cell is protoplasm. Protoplasm encompasses all the contents within a cell membrane, including the cytoplasm and the nucleus. It is a vital substance that serves as the medium in which cellular processes occur, facilitating communication and metabolic functions.

Cytoplasm, while also essential, specifically refers to the gel-like fluid within the cell that houses organelles, but does not include the nucleus. Chloroplast is an organelle found in plant cells responsible for photosynthesis and has a distinct green color due to chlorophyll, which does not relate to the colorless aspect of living cell material. The nucleus is the control center of the cell that contains genetic material but is not synonymous with the entirety of living cell material. Thus, the correct terminology to refer to the living substance within the cells is protoplasm.