01:119:115 Lecture Notes - Lecture 4: Radiometric Dating, Banded Iron Formation, Harold Urey
3 Oct 2018
School
Department
Course
Professor
Document Summary
Abiotic synthesis of monomers. (need monomers created without life) First life developed form non-living organic molecules abiogenesis. Those molecules had to form spontaneously abiotic synthesis. Super highly electronegative and tends to break chemical bonds. O2 only forms 2 bonds not conducive to building (1) Free energy source- forming biological molecules making bonds. Oparin-halda(cid:374)e hypothesis: life for(cid:373)ed (cid:374)ear earth"s surfa(cid:272)e- shallow water. Basically, can we generate some organic compounds with electricity that are needed to create life. (1) Recent work- repeated under many conditions, many molecules produced (1) (2) (3) (4) Iron-sulfur world hypothesis: organic molecules were originally formed abiotically at hydrothermal vents. Hot h2o, co, iron, and nickel sulfides released. Liposome- with form large hallow bubble rather than a bilayer sheet. Self-replication- i(cid:374) li(cid:448)i(cid:374)g (cid:272)ells ge(cid:374)eti(cid:272) i(cid:374)for(cid:373)atio(cid:374) stored i(cid:374) dna, transmitted vis mrna, translated into protein. Though that rna was first nucleic acids in living things. Rna world hypothesis- the first cells used rna to store and copy genetic information.
