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nmdcat.online June 27, 2026

The function of a buffer, such as the bicarbonate system in blood, is vital for an organism’s survival because it

A. Prevents changes in the concentration of a substrate
B. Maintains a constant temperature in the face of external heat
C. Prevents drastic changes in the pH of a solution upon the addition of an acid or base
✓
D. Acts as a cofactor for the enzyme carbonic anhydrase

📝 Explanation

Buffers are aqueous systems that resist changes in pH. The bicarbonate system (H2CO3/HCO3⁻) neutralizes small amounts of added acid or base, keeping the blood pH within the narrow physiological range (7.35-7.45) essential for enzyme function and protein stability.

📖 Additional Information

  • Prevents changes in the concentration of a substrate
  • Maintains a constant temperature in the face of external heat
  • Prevents drastic changes in the pH of a solution upon the addition of an acid or base
  • Acts as a cofactor for the enzyme carbonic anhydrase

Buffers are aqueous systems that resist changes in pH. The bicarbonate system (H2CO3/HCO3⁻) neutralizes small amounts of added acid or base, keeping the blood pH within the narrow physiological range (7.35-7.45) essential for enzyme function and protein stability.

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