All living beings, either unicellular or multicellular, are constituted by cells. We can affirm that life is based on cell function and death in such operation ceases. We can also say that the vital functions of each cell are based on the operation of such cells ribosomes.

Ribosomes are organelles composed of RNA and proteins that form two subunits of different weight. Are synthesized in the nucleolus and deposited in the cytoplasm where they perform read functions nucleotide chain of RNA from the nucleus to form chains of amino acids constituting the specific and functional protein each cell type.

However the operation of the ribosome is not an independent phenomenon, since they are related to two types of substances derived from the routes of shikimic acid and lectin and both, in turn, are encoded in the circular DNA of plant cells .

This is the biochemical mechanism that plants have used, exclusively, over millions of years to form first, the circular DNA of mitochondria, giving rise to animal cells to synthesize second time, the shikimic acid and its derivatives stimulate the nucleolus and the nucleus of animal cells to form ribosomes, and finally to synthesize carbohydrates from lectins that once joined to amino acids give rise to N-glycosidasas inhibiting ribosome function.

Thus in the circular DNA of plant cells is encoded the beginning and end of both plant and animal cell life.