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BIO NMDCAT Biological Importance of Water
nmdcat.online June 27, 2026

The ionization of water, yielding H⁺ and OH⁻ ions, is a fundamental process because it

A. Provides the primary energy source for cellular respiration
B. Determines the pH of a solution and dictates the reactivity of biological molecules
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C. Establishes the osmotic gradient across all biological membranes
D. Leads to the formation of the oxygen released during photosynthesis

📝 Explanation

Water dissociates slightly into H⁺ (actually H₃O⁺) and OH⁻. The concentration of these ions, expressed as pH, is critical. Enzyme activity, protein structure, and nucleic acid stability are all highly sensitive to the hydrogen ion concentration established by water's ionization.

📖 Additional Information

  • Provides the primary energy source for cellular respiration
  • Determines the pH of a solution and dictates the reactivity of biological molecules
  • Establishes the osmotic gradient across all biological membranes
  • Leads to the formation of the oxygen released during photosynthesis

Water dissociates slightly into H⁺ (actually H₃O⁺) and OH⁻. The concentration of these ions, expressed as pH, is critical. Enzyme activity, protein structure, and nucleic acid stability are all highly sensitive to the hydrogen ion concentration established by water's ionization.

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