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Rna world hypothesis

However, arguments regarding whether life on Earth began with RNA are more tenuous. Stromatolites — like these, found in the World Heritage Area of Shark Bay, Western Australia — may contain cyanobacteria, which were most likely earth's first photosynthetic organisms. This hypothesis is supported by RNA's ability to participate in the storage, transmission, and duplication of genetic information, similarly to DNA, coupled with its ability to act as a ribozyme (similar to an enzyme), catalyzing certain reactions.

Rna world hypothesis

Rna world hypothesis

The RNA world would have eventually been replaced by the DNA, RNA and protein world of today, likely through an intermediate stage of ribonucleoprotein enzymes such as the ribosome and ribozymes, since it is argued that proteins large enough to self-fold and have useful activities would only have come about after RNA was available to catalyze peptide lation or amino acid polymerization. Yet such complexity cannot have stood at the orin of life.

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  • There is now strong evidence indicating that an RNA World did indeed exist before DNA- and protein-based life.


    Rna world hypothesis

    Rna world hypothesis

    Rna world hypothesis

    Dr Graham Cairns-Smith, physical chemist, is well known for a bizarre theory that the first living organisms were clay minerals of the orin of life. The general notion of an “RNA World” is that, in the early development of life on the Earth, genetic continuity was assured by the replication of RNA and genetiy encoded proteins were not involved as catalysts.

    Rna world hypothesis

    If life arises from nonliving chemicals, there must be intermediate forms, "precellular life." Of the various theories of precellular life, the leading contender is the RNA world. WRITE A JINGLE OBAMA From the point of view of reproduction, molecules exist for two basic purposes: self-replication and catalysis assisting self-replication.


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