[BIO1140] - Midterm Exam Guide - Ultimate 26 pages long Study Guide!
6 Feb 2017
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Topic 1 introduction to cell biology and the cell"s features. Presumed to have arisen by the enclosure of self-replicating rna in a membrane composed of phospholipids. This would have maintained them as a unit, capable of self-reproduction and further evolution. The first energy-generating reactions presumably involved the breakdown of organic molecules in the absence of oxygen. These reactions are likely to have been a form of the present-day glycolysis (anaerobic breakdown of glucose to lactic acid) All present-day cells carry out glycolysis, with goes hand it hand with the notion that these reactions arose very early in evolution: evolution of photosynthesis: Provided independence from the utilization of preformed organic molecules. The release of o2 as a consequence of photosynthesis changed the environment in which cells evolved and is commonly thought to have led to the development of oxidative metabolism. Or it could have been evolved before photosynthesis.
