Mitochondria and chloroplasts are similar to modern-day in that they also have arranged in small, closed loops; they have similar for making proteins; and they also reproduce by a process of fission

Mitochondria and chloroplasts are similar to modern-day bacteria in that they also have DNA arranged in small, closed loops; they have similar organelles for making proteins; and they also reproduce by a process of fission.

Explanation:

Mitochondria and chloroplasts are thought to originate from bacteria because they share many similarities.

The first living organisms, prokaryotes, were unicellular, so all they needed to survive was there in that one cell: from DNA to organelles. However, this DNA is very different from the eukaryotic cell's DNA: bacterial DNA is small, circular and translates to fewer proteins.

Mitochondria and chloroplasts also have small DNA used to synthesize proteins for their use. These organelles can also divide themselves by fission as bacteria do.

For these reasons, the endosymbiotic theory was created: eukaryotic cells probably come from bacteria.

bacteria

DNA

similar 70s  Ribosomes.

These answers are  the basis of endosymbiont theory that, both mitochondria and chloroplast share certain characteristics listed above, which are also seen in bacteria, and was concluded that both organelles were bacteria which can now live independently in new hosts.

Mitochondria and Chloroplasts have DNA not bounded with histone protein just like in Bacteria, a further proof to support this theory.

The set of genes on both organelles  can also be found in prokaryotes further supporting the theory.

The facts that the two organelles have ability to undergo  binary cell division, a cell division associated with prokaryotes( Bacteria), replicating their DNA, and independently controlling the sequence of cell division .This  buttress the fact that, these organelles were actually prokaryotes.

Although both organelles have  separate DNA , these are not similar, thus they can not have similar DNA for making protein, but both contains similar 70s Ribosomes for making their proteins.

Explanation:

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