LM10-1 - 1 Evolution In the beginning • H and some He...

Info iconThis preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: 1 Evolution: In the beginning... • H and some He atoms were produced in “Big Bang” • Subsequently, all elements lighter than, and including, Fe are produced by fusion reactions in massive stars • All atoms heavier than Fe arise from catastrophic death of massive stars • We are all stardust and stardust is everywhere 2 Time scale of life on Earth (Fig. 17.1) • The earth formed 4.6 BYA • Oldest living fossils (stromalites, related to Cyanobacteria) are 3.5 billion yrs. old • Earliest life forms evolved while earth was still hot and anoxic ( 3.8 billion years ago), but liquid H 2 O was available • Probiont is term given to pre-cell (potentially composed of RNA/liposome) Stanley Miller et al • Miller & Urey in early 1950’s tried to make building blocks of life from proposed early earth components (H 2 , H 2 O, CH 4 , NH 4 ) • Added heat and electrical discharges • Rapidly generated AAs • Other experiments using HCN/different starting materials made sugars and nucleotide bases, lipids 3 Spontaneous development of other cellular...
View Full Document

This note was uploaded on 03/31/2010 for the course MCB 3020 taught by Professor Ogden during the Spring '08 term at University of Florida.

Page1 / 13

LM10-1 - 1 Evolution In the beginning • H and some He...

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online