BIO 2110 Lecture Notes - Lecture 2: Retina, Archaea, Negative Feedback
26 Jan 2017
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Document Summary
Life on the earth is a chronicle of the production and utilization of oxygen. Still some life, like the archaea, anaerobic, original extremophiles. Purple protein allows for photo energy use by using light to change gradient, eg like eye retina cells. Can fix carbon from atmosphere like from co2. Theories like primordial soup and the meteorite one. Primordial soup shocked with energy a lot like in early earth days, lots of energy. No o2, but abundance of inorganic and organic substrates in atmosphere. Deposits of iron oxide in lakes and oceans. Because they can use oxygen, it is not toxic and they thrived. As atmosphere approached a stable environment, organisms evolved to match it. Can only convert 2% of stored energy to atp compared to 40% in aerobic. Vascular system for delivery of oxygen to internal tissues. Stressors are disadvantageous, organisms need to expend more energy to survive. Stressors modulated by things like seasons, solar radiation (north, south, equator)
