Hypothesis of early microorganisms

Question: Justify the hypothesis of early microorganisms were chemolithotroph and why phototrophic organisms that came after had pigments that absorbed maximally at UV and IR radiation

Question: Although physiologically distinct, chemolithotrophs and chemoorganotrophs share a number of features with respect to the production of ATP. Discuss these common features along with reasons why the growth yield (grams of cells per mole of substrate) of a chemoorganotroph respiring glucose is so much higher than for a chemolithotroph respiring sulfur.


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