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nnect.mheducation.comf 7 and 8 Help Save & Exit Subr O You recelved partial credit in the previous attempt View previous attempt Drag the labels to complete each of the sentences that discuss the relationship between the evolution of aerobic organisms and the success or photosynthetic microbes. The first cels to evoive almost 4 billion years ago (bya) were lkely that developed in the environment of the young planet earth. Their ATP production would have been limted to that produced from O,rich With the evolution of the build-up of cxygen gas in the environment. Before the evolution of superoide dismutase, oxygen would partially reduce to superoxide anions and moleoules that are very damaging to cells prokaryotes approximately 3 bya came and peroxidases in organisms, the oxidative phosphorylation aerobic eukaryotes Survival of the Sthest led to evolution of those organisms that could both neutraize the howic okygen forms and incorporate, through the production of the enzymes inwolved in oxygen into their metabolic pathways o-poor 5 8 command optionExplanation / Answer
The first cells to evolve almost 4 billion years ago (bya) were likely anaerobic prokaryotes that developed in th O2-poor environment of the young planet earth.Their ATP production would have been limited to that produced from fermentation pathways.
With the evolution of multicellular prokaryotes approximately 3 bya, came the build-up of oxygen gas in the environment. Before the evolution of superoxide dismutase, catalase and peroxidases, the oxygen would partially reduce to peroxide molecules that are very damaging to cells.
Survival of the fittest led to the evolution of those organisms that could both neutralize the toxic oxygen forms and incorporate, through the production of enzymes involved in oxidative phosphorylation ,oxygen into their metabolic pathways.
Utilization of oxygen brought with it an unexpected bonus : a maximum 40 ATP molecules could be produced rather than 2 ATP molecule yield from fermentation.While it took almost 2 billion years after the appearance of the first prokayotic cells to evolve the first eukaryotic cells.(about 2.5 bya), O2 rich aerobic eukaryotes fossils,were discovered approximately 1.4 bya.This suggests that with higher ATP yield came the burst of evolution as a result of faster growth and development.
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