the stuff we see today happened in past. Time’s immense.
events in earth history had
occurred in the past a sudden events and by processes unlike those operating today.
: spontaneous generation
, no extinction, inheritance of acquired traits.
not linear, extinction, no organic flux.
modification, variations in species, homology, vestigal features, biogeography, fossil record, nested hierarchy, natural
selection, genetic drift.
terrestrial- moisture/temp, gravity, light, nutrients. Aquatic- light, energy, salinity,
info stored in molecules (DNA, RNA) passed genetically w/ random mistakes, and set of instructions to
interpret molecules (genetic code
RNA carries genetic info and RNA acts as an enzyme(ribozymes)
catalyzes own replication.
Organic building blocks origins:
- aminos, fatty acids, sugars, nucleic acids produced by
chem. Reactions. Miller/Urey
- Electric current through simulated early earth. Made ‘geo-junk’ rich in amino acids and sugars.
- comets rich in organic molecules. Molecules come from space and interplanetary dust.
hooking up building blocks with water molecules as by products.
Clay minerals concentrate
building blocks out of solution and catalyze. Proto-metabolism:
dehydration occurs on mineral surfaces where other energy
releasing chem. Reactions are occurring. Prebiotic Foam:
Lipid and protein bubbles trap and concentrate molecules. Ice Beer
Freezing concentrates molecules.
: organic molecules characteristic of particular
groups. Isotope Tracers:
distinctive sorting of isotopes by biochemical reactions.
(lipids): Cell walls of Eukaryotes(2.7 Gyr).