Evolution of Cells (Cooper, 1997 p. 4-15) In spite of the differences between prokaryotic and eukaryotic cells, the same basic molecular mechanisms govern all cells. Similarities in DNA and protein structures would indicate that all life is related. These similarities allow knowledge of one cell type to be extrapolated and generalized to other types of cells. Evolution is the change in the genetic makeup of a population due to the selective advantage of some variation in the population. From geological evidence the time scale of evolution for this world started with it's formation about 4.6 billion years ago ( Fig. 1 ). The formation of organic molecules in the reductive environment thought to be present on the early earth was demonstrated by Stanley Miller. (Cooper, Fig. 1.2) The first genetic material was probably made up of RNA because of it's replicative and catalytic properties. Early cells in a sea of organic molecules developed various strategies to obtain energy. "The generation and controlled utilization of metabolic energy is central to all cell
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This document was uploaded on 11/03/2011 for the course BIOLOGY MCB2010 at Broward College.