AST 248 Lecture Notes - Lecture 12: Endolith, Cold Seep, Treemapping

• School: Stony Brook University
• Department: Astronomy
• Course: AST 248
• Professor: James Lattimer

Document Summary

All lifeforms on earth have a common system. Examples: universal usage of dna to store genetic information the ribosome technique of protein synthesis proteins serve as enzymes and catalysts the same 20 amino acids are always used, and only left-handed ones a universal genetic code. Dna triplets coding for same amino acid the use of proteins and lipids to make membranes the use of the atp-adp cycle for chemical energy. Proteins are needed to make enzymes, yet enzymes are needed to make proteins. Nucleic acids are needed to make proteins, yet proteins are needed to make nucleic acids. It must have been the result of an extended evolution. In evolutionary terms, it is very far from the original organisms. It is possible to construct detailed phylogenetic trees based either on morphology or molecular (genetic) data. Conclusion: it must be that all organisms on earth are descended from a single common ancestor. Phylogeny and the nature of the common ancestor.