Biology 2581B Chapter Notes - Chapter 2: Permafrost, Archaea, Cytoskeleton

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Reading: life"s big leaps: critical moments in evolution. Jump from single cells to complex organisms represents an evolutionary gulf. Eukaryotes are more sophisticated than prokaryotes: a nucleus that houses dna; an energy-producing device known as the mitochondrion; and molecular architecture, known as the cytoskeleton, that controls cell shape and movement. One group theorizes that eukaryotes emerged in a rapid burst, driven by the acquisition of the cellular energy factories known as mitochondria. Mitochondria couldn"t have developed in simple cells; some level of complexity must have evolved before mitochondria came onboard. Loki - descended from an ancient lineage and is a simple organism with patches of apparent complexity. Genetic analysis places loki squarely within the single-celled archaea. Has intriguing collection of genes that look as though they would be more at home in eukaryotes. Genetic machinery suggests that the organism might be able to engulf other cells, the first step in the creation of mitochondria.

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