The origin of life-RNA WORLD?????

The origin of life depends on the singe question – How did early cells could have arisen?
Modern cells consist at a minimum of plasma membrane enclosing water in which numerous chemicals are dissolved and sub cellular structures float. It was thus believed that the first self-replicating entity was much simpler than even the most primitive modern living cells. Before there was life, and yes, Earth was a different place: completely hot and anoxic, with an atmosphere which was completely rich in gases such as hydrogen, methane, carbon dioxide, nitrogen, and ammonia. Earth’s surface was like a pre biotic soup in which chemicals reacted with one another, randomly “testing” the usefulness of the reaction and the stability of the resulting molecules. Some reactions released energy and would eventually become the basis of modern cellular metabolism. Other reactions which occurred created molecules that could function as catalysts, some aggregated with other molecules to form the predecessors of modern cell structures, and others were able to replicate and act as units of hereditary information.
Proteins have two major roles in modern cells – structural and objective.
Catalytic proteins are called enzymes, in cells. Thus enzymes act as the workhorses of the cell. DNA stores hereditary information and can be replicated to pass the information on to the next generation. RNA is involved in converting the information stored in DNA into proteins. Proteins can do cellular work, but their synthesis is dependent on their proteins and RNA, and information stored in DNA. DNA can’t do cellular work. It’s only work is to store genetic information and it is involved in its own replication process which is a process that requires proteins. RNA is synthesized using DNA as the template and proteins as the catalysts for the reaction.
Based on these considerations, it seemed to evolutionary biologists that at some time in the evolution of life there must have been a single molecule that could do both cellular work and replicate itself. A possible solution to the nature of this molecule was suggested in 1981 when Thomas Cech discovered an RNA molecule in the protest Tetrahymena that could cut out an internal section of itself and slice the remaining sections back together. Since then, other catalytic RNA molecules have been discovered, including an RNA found in ribosomes that is responsible for forming peptide bonds – the bonds that hold together amino acids, the building blocks of proteins. Catalytic RNA molecules are now called ribozymes.
The discovery of ribozymes suggested the possibility that RNA at some time had the ability to catalyze its own replication, using itself as the template. In 1986, a term was coined – RNA WORLD to describe a precellular stage in the evolution of life in which RNA was capable of storing, copying, and expressing genetic information. Also it catalyzes other cellular chemical reactions. This important evolutionary step is easier to imagine than other events in the origin cellular life forms because it is well known that lipids, major structural components of the membranes of modern organisms, form liposomes which are bounded by a lipid layer.