BIO 1406 Lecture Notes - Lecture 4: Paleozoic, Lipid Bilayer, Radiocarbon Dating
11 Apr 2016
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Past organisms were very different from those now alive. The fossil record shows __________________ changes over large time scales, for example. Concept 25. 1: conditions on early earth made the origin of life possible. Chemical and physical processes on early earth may have produced very simple cells through a sequence of stages: abiotic synthesis of small organic molecules. Earth formed about 4. 6 billion years ago, along with the rest of the solar system. Bombardment of earth by rocks and ice likely __________________ and prevented seas from forming before about 4 billion years ago. Earth"s early atmosphere likely contained water vapor and chemicals released by volcanic eruptions (nitrogen, nitrogen oxides, carbon dioxide, methane, ammonia, hydrogen) In the 1920s, a. i. oparin and __________________ hypothesized that the early atmosphere was a reducing environment. In 1953, __________________ and harold urey conducted lab experiments that showed that the abiotic synthesis of organic molecules in a reducing atmosphere is possible.
