GRE Reading Passage<\/a><\/div>\n<\/div>\n<\/div>\n<\/div>\n\n\n\nMedium Difficulty GMAT Passage | ~225 words<\/h2>\n\n\n\n
The emergence of biological systems on Earth approximately four billion years ago represents one of science’s most profound mysteries, with amino acid interactions now standing at the center of this transition theory. While scientists haven’t definitively explained this process, recent experimental evidence has illuminated potential pathways through which non-living chemical compounds evolved into primitive biological structures. Researchers hypothesize that an intricate molecular choreography involving amino acids played a decisive role; these fundamental compounds linked together, dissociated, and recombined repeatedly, ultimately forming the precursors to life as we understand it.<\/p>\n\n\n\n
Biochemists have provided substantive evidence supporting theoretical models of life’s origins through contemporary investigations. They identified critical differences in reactivity and polymerization potential by comparing “proteinaceous” amino acids\u2014those universally present in living organisms\u2014with amino acids absent from biological systems. Scientists developed experimental models simulating primordial conditions after recognizing that early Earth’s water cycle created environments conducive to peptide formation. They specifically employed drying reactions that replicate the natural evaporation-heat application cycle believed to have catalyzed amino acid polymerization on early Earth. <\/p>\n\n\n\n
This research extends beyond origin-of-life studies, offering valuable insights for synthetic chemistry, where scientists endeavor to engineer novel molecules for pharmaceutical applications and material science innovations. The understanding of fundamental mechanisms through which peptides naturally form provides critical guidance for designing artificial molecules with precisely targeted therapeutic properties, potentially revolutionizing drug development methodologies.<\/p>\n\n\n\n
On an alien Earth-like planet, which of the following conditions would most likely facilitate the formation of organic precursors to life, based on the processes described in the passage?<\/strong><\/p>\n\n\n\n\n- Regular methane rain cycles that deposit cyanothiols on silicon-rich surfaces, followed by exposure to intense ultraviolet radiation<\/li>\n\n\n\n
- Constant submersion of zirconium-based catalysts in superheated sulfuric acid pools without evaporation cycles<\/li>\n\n\n\n
- Sequential hydration and dehydration of ferrocatalytic compounds through periodic flooding and evaporation near volcanic vents<\/li>\n\n\n\n
- Permanent freezing of phosphoramide compounds within ammonia ice sheets without temperature fluctuations<\/li>\n\n\n\n
- Continuous bombardment of stable xenoprotein structures by gamma radiation in an oxygen-saturated atmosphere<\/li>\n<\/ol>\n\n\n\n
\n GMAT RC Question Answer & Explanation ▼<\/span><\/strong><\/summary>\nThe passage emphasizes how Earth’s water cycle created environments conducive to peptide formation through evaporation and heat application cycles. Scientists specifically replicated these drying reactions in their experiments. Similarly, option (C) describes a cyclical process of hydration and dehydration near volcanic vents, which parallels the environmental conditions hypothesized to have catalyzed amino acid polymerization on early Earth. \n
\nCorrect Answer: Choice (C)<\/strong><\/p>\n\n<\/details>\n\n\n