The Urey-Miller experiment determined which of the following results?
Correct answer: D. Organic molecules can arise from inorganic precursor
- A. DNA replicates by semiconservative replication
- B. Cyanobacteria were responsible for the oxygenation of the atmosphere
- C. The early atmosphere was composed of ammonia and methane
- D. Organic molecules can arise from inorganic precursor
Explanation
Stanley Miller and Harold Urey simulated early Earth's atmosphere (methane, ammonia, hydrogen, and water vapor) and passed electric sparks to mimic lightning. They obtained amino acids and organic molecules, proving life's building blocks can form abiotically.
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Chromosomes are DNA-protein structures that carry genes and become visible during cell division. Coverage includes chromatin, centromeres, sister chromatids, homologous chromosomes, chromosome number, and the distinction between diploid and haploid cells, with links to DNA replication, mitosis and meiosis.
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