The question of how the cage appeared, still remains open: it was so long ago that the person can only build hypotheses as everything really happened. Achievements of chemistry, physics, biology and other sciences help him with it.
Instruction
1. The first organic compounds which served subsequently as material for living cells arose under the influence of various natural factors: ultra-violet radiation, heat, electric discharges.
2. Emergence of the first replicators became the key moment in evolution of the organic world. The replicator is the molecule capable to catalyze synthesis of own copies and matrixes (reproduction analog). RNA and DNA belong to such molecules.
3. Molecules replicators started the mechanism of dobiologichesky (chemical) evolution which first subject were primitive molecules RNA consisting of several nucleotides. They were already capable to reproduction (replication), were exposed to mutations (to mistakes when copying), death (destructions of a molecule), participated in fight for survival and natural selection.
4. RNA, unlike DNA – a universal molecule. It not only can be the carrier of hereditary information and to be a replicator, but also is capable to carry out an enzymatic role that is not peculiar to DNA.
5. At some point there were RNA-enzymes accelerating synthesis of lipids. Fat molecules of a polyarna, have linear structure, and in a suspension spontaneously gather in spherical covers. So RNA could surround themselves with the protective covers consisting of lipids.
6. At increase in the RNA sizes, multipurpose molecules began to appear. Performance of various functions was differentiated between their separate parts.
7. Initially cell fission happened under the influence of external factors. Thanks to intracellular synthesis of lipids and increase in the sizes of a cage it lost durability, the amorphous cover ran around like a mad. In the subsequent this process departed under regulation of enzymes.
8. In an issue of emergence of living cell there are many unresolved problems. For example, how functions of storage of hereditary information passed from RNA to DNA how difficult processes in a cage at what stage the synthesis of proteins began were synchronized? It is only still possible to guess all this.