First animal prokaryotes: mitochondria. Dissemination 60th
Mitochondria are cellular organelles able to reproduce, this fact, as chloroplast, are an indication of its existence as free primitive cell.
Mitochondria, present inside of current eukaryotic cells, are formed by a double exterior membrane where inside has circular DNA, ribosomes S55 in animal eukaryotic cells and s70 in plant eukaryotic cells.
The mitochondria essential function is produce energy, to eukaryotic cells that host them, using oxidative process of simple organic molecules ((mono carbohydrates, fatty acids and amino acids) resulting in energy and carbon dioxide production.
We have defined the mitochondria as the first prokaryotic animals. This is because, before joining by endosymbiosis in eukaryotic cells, mitochondria were free cells did not produce their own source of energy, this is a basic feature of "animal cells", and this makes them dependent on "cells plant "production of organic matter.