Origin of Life K. Sathasivan. Are we alone? A.Yes B.No.

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Presentation transcript:

Origin of Life K. Sathasivan

Are we alone? A.Yes B.No

How do you think life originated on earth? A. Extraterrestrial aliens brought it B. Came with meteors from other planets C. Some superhuman powers created it D. Chemical from primordial soup combined to make life E. None of the above

History of Life

Stromatolites

Early prokaryotes

Cyanobacteria fossils

Possible Sources of Life’s Origin

Possible Steps in the Origin of Life Protobionts and Liposomes

DNA  RNA  PROTEIN (Genetic (Information (Catalytic and Information) and catalytic) Structural) A.DNA B.RNA C.Protein D.Carbohydrates E.Lipids Which came first?

Abiotic RNA Replication

Primitive RNA and Proteins

Which of the following is/are testable hypothesis about origin of life on earth? A. Extraterrestrial aliens brought it B. Came with meteors from other planets C. Some superhuman powers created it D. Chemical from primordial soup combined to make life E. None of the above

The Five Kingdom System

Domain Systems

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