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