In Euglena and some dinoflagellates, these are surrounded by three membranes as a result of a secondary endosymbiotic events.
Members of the chromista supergroup contain a nucleomorph, a reduced nucleus whose presence supports the most popular theory regarding the formation of these. One important event in the evolution in this organelle was the development of protein import machinery, the translocases TIC and TOC. The innermost membrane of this organelle contains the stroma which surrounds granum, or stacks of thylakoid discs, connected by lamellae. In Euglena and some dinoflagellates, these are surrounded by three membranes as a result of a secondary endosymbiotic events. The ancestor of this organelle was a chlorophyll a containing cyanobacteria that was incorporated into an archaeplastidan.  For 10 points, name this organelle found in plant cells that performs photosynthesis.
Members of the chromista supergroup contain a nucleomorph, a reduced nucleus whose presence supports the most popular theory regarding the formation of these.
{Chloroplast}