lec 7 - Emergence of Life on Earth Life's Origins 3...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
1 Emergence of Life on Earth www.palaeos.com www.beyondbooks.com 2 Life’s Origins – 3 Problems ± Earliest steps cannot be directly observed ± Even simplest extant life forms are very complex ± Unclear which organic molecules were used to store information (DNA, RNA, or proteins) 3 • Protobionts – aggregations of abiotically produced molecules • Requirements for evolution of life • Abiotic formation of organic molecules • Spontaneous organization • Metabolism 4 • Miller & Urey (Fig. 3.1) – simulated conditions on early Earth • Energy source + inorganic molecules • Amino acids • Slightly altered conditions • Wide range of other organic molecules Abiotic Organic Molecules
Background image of page 1

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

View Full DocumentRight Arrow Icon
5 • Organic molecules may have arrived on Earth in meteors – surprisingly abundant in space • Murchison meteorite – amino acids & amphipathic lipids • UV bombardment of interstellar ice – amphipathic lipids Abiotic Organic Molecules Freeman Fig. 3.3 6 • Hydrophobic interactions of amphipathic lipids (Fig. 6.7) • Biological order at expense of universal disorder • Major area of study in past decade Spontaneous Organization 7 • Enhanced by the presence of clay particles
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 04/22/2008 for the course BSCI 207 taught by Professor Higgins during the Spring '08 term at Maryland.

Page1 / 6

lec 7 - Emergence of Life on Earth Life's Origins 3...

This preview shows document pages 1 - 3. Sign up to view the full document.

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