Haemoglobinic acid is formed when

  1. haemoglobin combines with oxygen
  2. CO₂ binds to iron
  3. chloride binds haemoglobin
  4. haemoglobin combines with hydrogen ions
Answer

D) haemoglobin combines with hydrogen ions

HHb forms as H⁺ binds Hb. AS & A Level Biology · Topic 8 Transport in Mammals · 8.2 Transport of oxygen and carbon dioxide

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