1Chemical Evolution Hypothesis
Abiogenesis, lack of O2, chemical building blocks of life in atmosphere
2Muchison Meteorite
biological molecules came from outside Earth, D-Sugars and L-amino acids
3RNA World Hypothesis
RNA polynucleotide could replicate with itself (Acellular catalyst)
4Possible Acellular catalysts?
Clay mineral surfaces and hydrothermal vents
5Warm little ponds
Life began when meteorites leached elements into warm ponds
6Archean Membranes
Isoprene chains, phosphate, L-glycerol
7Are bacteria and archae related?
No, archae is more related to eukaryotes than to bacteria
8Oparin - Haldene Theory
Theory suggests simply organic materials formed and then ultraviolet made it complex
9Progressive, or escape hypothesis
Viruses arose from genetic elements that gained the ability to move between cells
10Regressive, or reduction hypothesis
Viruses evolved from complex cells that lost genetic information, adopting a parasitic lifestyle instead
11Virus-first hypothesis
Viruses predated cells and contributed to rise of cellular life