Outline 03 2008 From so simple a beginning

Outline 03 2008 From so simple a beginning - Lecture 03:...

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Lecture 03: FROM SO SIMPLE A BEGINNING: CHEMISTRY AND THE ORIGIN OF LIFE Summary. We may only speculate about the origin of life on earth. From the geological record we know the approximate time that organisms producing oxygen first appeared. The later fossil record provides a minimum age for organisms composed of cells. The big question concerns the likelihood that life arose spontaneously. We would like to know what the first living things were actually like. In this lecture, we review the evidence that suggests that life originated spontaneously from a pre-biotic “soup” of simple organic chemicals in seawater. We also consider a relatively new idea, that of an RNA world, in which RNA served both as hereditary molecule and catalyst for biochemical reactions. Reading Assignment Campbell, N. A. and Reece, J. B. (2008), Biology. Read Chapter 4 (pp. 58-67) and Chapter 25 (pp. 507-512). To Review
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Outline 03 2008 From so simple a beginning - Lecture 03:...

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