BSC 2011C Chapter Notes - Chapter 25: Stanley Miller, Alexander Oparin, Macroevolution
Document Summary
Concept 25. 1: conditions on early earth made the origin of life possible: chemical and physical processes could have produced simple cells through sequence of 4 main stages a. i. Abiotic (nonliving) synthesis of small organic molecules, such as amino acids and nitrogenous bases a. ii. Joining of these small molecules into macromolecules, such as proteins and nucleic acids a. iii. Packaging of these molecules into protocells (droplets with membranes that maintained an internal chemistry different from that of their surroundings a. iv. Origin of self-replicating molecules that eventually made inheritance possible: synthesis of organic compounds on early earth b. i. First atmosphere had little oxygen and was probably thick with water vapor and other various compounds released by volcanic eruptions b. iii. Haldane independently hypothesized that earth"s early atmosphere was a reducing environment b. iv. Alkaline vents release water that has a high ph and i warm rather than hot b. vi. 1.
