Separated compartments within a cell with specialized functions, e.g. nuclei (containing
most of the genetic material),
mitochondria
(respiratory energy supply for the cell), chloroplasts (location of
photosynthesis ) etc.
Source:
PAC, 1992, 64, 143
(Glossary for chemists of terms used in biotechnology (IUPAC Recommendations 1992))
on page 162