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From his experiments, S.L. Miller produced amino acids by mixing the following in a closed flask:
Miller used Methane (CH4), Hydrogen (H2), Ammonia (NH3), and water vapor (ratio 2:2:1 or 2:1:2) with electric spark discharge at exactly 800°C. Beware of fake formulas like CH3 or NH4, and lower temperatures like 600°C. Mark Option (1) in 5 seconds!
In 1953, Stanley L. Miller, an American scientist, created electric discharge in a closed flask containing CH4, H2, NH3, and water vapor at 800°C, simulating the prebiotic reducing atmospheric conditions of early Earth.
The gas molecules were methane (CH4, not methyl radical CH3), molecular hydrogen (H2), and ammonia (NH3, not ammonium cation NH4). Options (2) and (4) incorrectly use CH3 and NH4.
The electric spark discharge inside the closed simulation chamber operated at 800°C. Options (3) and (4) propose 600°C, which is historically and factually incorrect.
After running the simulation for one week, Miller observed the synthesis of simple amino acids (glycine, alanine, and aspartic acid) from these inorganic precursors.
Diagnose every choice: Know exactly why the right option works and why distractors fail.
Factually and chemically exact; correctly identifies all four gaseous components and the precise temperature (800°C).
Incorrect chemical formulas; uses methyl (CH3) and ammonium (NH4) instead of methane (CH4) and ammonia (NH3).
Incorrect temperature; Miller operated his electric spark discharge at 800°C, not 600°C.
Incorrect formula (CH3) and incorrect temperature (600°C).
NTA purposefully plants typos in subscripts: CH3 vs CH4, and NH4 vs NH3, combined with temperature distractors (600°C vs 800°C).
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