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The Miller-Urey experiment simulated early Earth conditions and led to the formation of organic molecules like amino acids.
Ref: NCERT Class 12 Biology Chapter 6: Evolution Origin of Life - Theories Miller Urey Experiment
Free oxygen appeared much later after evolution of oxygenic photosynthesis by cyanobacteria. Initially atmosphere remained reducing because oxygen would be quickly consumed by ferrous iron and reduced gases. Absence of oxygen meant no ozone shield, permitting intense ultraviolet flux, and allowed reduced compounds like CH4, NH3, H2 to persist. This chemical milieu favored synthesis of organic monomers rather than their oxidation. The reducing nature itself explains lack of molecular oxygen, linking Reducing atmosphere to prebiotic stability. This concept integrates genetics, ecology and molecu
Ref: Alberts et al., Molecular Biology of the Cell, 6th ed., Chapter 1: Origin of Life.
Geochemical evidence indicates early Earth atmosphere lacked free oxygen and ozone. Instead it contained reducing gases such as methane, ammonia, hydrogen and water vapor from volcanic outgassing. Such reducing conditions prevented oxidative breakdown of newly formed organics, allowing accumulation of amino acids and nucleotides. Laboratory simulations like Miller-Urey replicate this setting. Without oxygen, ultraviolet radiation reached surface driving reactions. Understanding atmospheric chemistry explains why Reducing state is crucial for chemogeny preceding biological evolution. This conce
Ref: Alberts et al., Molecular Biology of the Cell, 6th ed., Chapter 1: Origin of Life.
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