Bacterial Origin of Certain Eukaryotic Organelles - Evidence for Evolution

The theory of an endosymbiotic relationship forming the origin of
certain organelles (cellular compartments) in eukaryotic cells is
pretty cool and the evidence is just too good to dismiss. This theory
was formally proposed in 1905 by a Russian botanist familiar with the
work of another botanist who noticed in 1883 that chloroplasts, the
organelle in plant cells that carries out photosynthesis, divide in a
manner strikingly similar to free-living cyanobacteria. This idea was
extended to include the mitochondria (the energy factories of our
cells) of all eukaryotic cells in the 1920s. Of course this idea was
not widely accepted at first, as is true with most scientific advances.
Newer microscopic technology revealed great structural similarity
between chloroplasts and cyanobacteria in the 1960s and the idea was
resurrected.
What is the current evidence supporting the idea that, at an ancient
date, one cell engulfed a bacteria and that the bacteria survived
inside that cell and was adapted over time to serve a specific and
unique, but vital, function inside the engulfing cell?
1) New mitochondria and chloroplasts are formed only by a process
similar to bacterial binary fission
2) These organelles are surrounded by 2 membranes; the inner membrane
shows differences in composition compared to other membranes of the
cell and it contains a peptidoglycan wall similar to a bacterial cell
3) Mitochondria and chloroplasts contain their own DNA (that's right
not all of your DNA is in the nucleus) that is similar to bacterial DNA
in its size and shape - ie nuclear DNA is straight, mitochondrial DNA
is circular like bacterial DNA
4) The ribosomes (important in protein manufacturing) of mitochondria
have biochemical properties resembling bacterial ribosomes rather than
the ribosomes of the cell
5) The amino acid that initiates protein synthesis for mitochondrial
proteins is the same as that used by bacterial cells which is not the
same amino acid as the cell uses to initiate protein synthesis.
There is more but those are the most convincing. This idea that at one
time our cell's ancestors were host to free-living bacteria is not
surprising. There are protists today that contain free-living bacteria
in their cytoplasm and the two get along quite nicely together. I think
it's an elegant illustration of symbiosis that has evolved to be
beneficial, even necessary, for the development of more complex
organisms. Adapting a bacterial cell to be our energy producers is an
ingenious detail of creation.