The process or processies predating other forms of cellular metabolic processes such as Photosynthesis. Such forms of metabolism are thought to have originated by plant and animal cell inveloping smaller specialized cells that were insoluble to the host cell.
Photosyntesis is a process originating from early proto-plant cells ingesting cyanobaceria, therefore replacing any protosynthesis the cells might have had.
by nibbit October 11, 2010