-DNA sequence analysis and phylogenetic estimates suggest that nuclear DNA contains genes that probably came from plastids.
-These organelles' ribosomes are like those found in bacteria.
-Proteins of organelle origin, like those of bacteria, use N-formylmethionine as the initiating amino acid.
-Much of the internal structure and biochemistry of plastids, for instance the presence of thylakoids and particular chlorophylls, is very similar to that of cyanobacteria. Phylogenetic estimates constructed with bacteria, plastids, and eukaryotic genomes also suggest that plastids are most closely related to cyanobacteria.

-Mitochondria have several enzymes and transport systems similar to those of bacteria.
-Some proteins encoded in the nucleus are transported to the organelle, and both mitochondria and plastids have small genomes compared to bacteria. This is consistent with an increased dependence on the eukaryotic host after forming an endosymbiosis. Most genes on the organellar genomes have been lost or moved to the nucleus. Most genes needed for mitochondrial and plastid function are located in the nucleus. Many originate from the bacterial endosymbiont.

Continued