Knowra Prebiotic chemistry Prebiotic chemistry Prebiotic chemistry studies chemical reactions that could have occurred on the early Earth before life emerged, including processes that formed life's molecular building blocks.
Miller–Urey experiment : A 1953 experiment that exposed water and gases to electrical sparks, producing amino acids and other organic compounds. It demonstrated that some organic building blocks can form from simple gases under simulated early-Earth conditions.
Amino acid : An organic molecule containing amino and carboxyl groups; amino acids are the building blocks of proteins. Their formation in early-Earth simulations provides a classic test of prebiotic synthesis.
Alexander Oparin : A Soviet biochemist who proposed that life arose through gradual chemical evolution in Earth's early environment. His 1920s account helped establish chemical evolution as a framework for investigating life's origins.
RNA-first hypothesis : A family of origin-of-life hypotheses in which RNA or RNA-like molecules preceded DNA and proteins. It prioritizes information-bearing polymers, while other proposals begin with metabolism or compartment formation.
Origin of life : The transition from nonliving chemistry to the first living systems on Earth. Prebiotic chemistry addresses possible steps toward this transition, but does not itself explain how life began.
Formose reaction : A reaction network in which formaldehyde forms sugars under alkaline conditions, often with calcium compounds as catalysts. It offers a route from a simple carbon compound to sugars relevant to early metabolism and nucleic acids.
Nucleotide : A molecule made of a nitrogenous base, a sugar, and one or more phosphate groups. Nucleotides are the units needed to construct RNA and DNA, but their prebiotic formation remains difficult to explain.
J. B. S. Haldane : A British geneticist and evolutionary biologist who independently proposed that early Earth supported the gradual formation of organic compounds. His 1929 essay proposed a chemically active early ocean, an influential setting for prebiotic reactions.
Metabolism-first hypothesis : A family of hypotheses proposing that self-sustaining chemical reaction networks preceded genetic polymers. It reverses the RNA-first emphasis by making chemical cycles, rather than heredity, the initial organizing feature.
Prebiotic synthesis of nucleotides : Research into chemical pathways that could produce nucleotide components and complete nucleotides without biological enzymes. A credible route must join sugar, base, and phosphate chemistry under compatible conditions.
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