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原文連結
論文資訊
- 類型：已發表論文
- 日期：2013-07-12
摘要
Some 演化ary innovations may originate non-adaptively as exaptations, or pre-適應s, which are by-products of other adaptive traits(1-5). Examples include feathers, which originated before they were used in flight(2), and lens crystallins, which are light-refracting 蛋白質s that originated as enzymes(6). The question of how often adaptive traits have non-adaptive origins has profound implications for 演化ary biology, but is difficult to address systematically. Here we consider this issue in 代謝, one of the most ancient 生物 systems that is central to all life. We analyse a metabolic trait of great adaptive importance: the ability of a metabolic reaction 網絡 to synthesize all biomass from a single source of carbon and energy. We use novel 計算 methods to sample randomly many metabolic 網絡s that can sustain
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