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BIO NMDCAT Concept of Evolution
nmdcat.online July 14, 2026

24. If primitive Earth’s atmosphere had contained a large amount of oxygen, the formation of amino acids would most likely have been:

A. Enhanced by oxidation
B. Unaffected by atmospheric composition
C. Greatly reduced because oxidation would occur
✓
D. Replaced by direct protein synthesis

📝 Explanation

Correct: Oxygen inhibits the accumulation of organic compounds by oxidizing them. A: Oxidation is unfavorable. B: Atmosphere strongly influences reactions. D: Proteins cannot form directly from inorganic substances. Concept: Application of chemical evolution.

📖 Additional Information

  • Enhanced by oxidation
  • Unaffected by atmospheric composition
  • Greatly reduced because oxidation would occur
  • Replaced by direct protein synthesis

Correct: Oxygen inhibits the accumulation of organic compounds by oxidizing them. A: Oxidation is unfavorable. B: Atmosphere strongly influences reactions. D: Proteins cannot form directly from inorganic substances. Concept: Application of chemical evolution.

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