The are the largest group of chloroplast lipids. Lipids of group B are linked to nucleotide diphosphate coupled alcohol. They represent the largest group of lipids in mitochondria and cytoplasmatic membranes. Their synthesis occurs in the cytosol. Group C consists of nucleotide diphosphate diglycerides that are linked to an alcohol.
Some reactions are likely to occur also in mitochondria.
This short outline points at the importance of the compartments as separate reaction spaces. They serve as energy reservoirs and are activated upon need. The catabolism is not a reversion of the anabolism although C 2 units are usually transferred to CoA during this process. It is spoken of a beta -oxidation. The involved enzymes belong to the lipase group.