Question

Carbon dioxide affects O2binding to Hb by: a) CO2forming iron carbonate with the heme-iron atom. b) Hb competing with carbonic anhydride for CO2. c) directly binding to heme-Fe in the oxygen binding site of hemoglobin. d) forming HCO3- that combines with H+ to increase CO2binding. e) forming H+ HCO3- where the H is an antagonist to oxygen binding to Hb.

Answer 1

Answer:

The correct answer is c) directly binding to heme Fe in the oxygen binding site of the hemoglobin.

Explanation:

Carbon dioxide is the waste product of cellular respiration.Carbon dioxide bind to hemoglobin to form carbaminohemoglobin in which the hemoglobin exist as T state or Tensed state.

        Carbon dioxide interact with the oxygen binding site of hemoglobin thus decreasing the affinity of hemoglobin for oxygen.