Oxygen and carbon dioxide bind to different parts of hemoglobin.
True
False
The Correct Answer is A
True: O₂ binds to the heme (iron) portion of hemoglobin, whereas CO₂ binds primarily to amino groups on the globin (forming carbaminohemoglobin) and much CO₂ is also converted to bicarbonate inside RBCs, so they bind/are carried at different sites/forms.
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Related Questions
Correct Answer is {"dropdown-group-1":"E"}
Explanation
A. No: no A/B antigens describes type O blood, not AB.
B. Anti-A and anti-B: those are antibodies found in the plasma of type O individuals; they are not RBC antigens and are not present in type AB plasma.
C. Anti-A: anti-A are plasma antibodies found in type B blood; the question asks about RBC antigens, not antibodies.
D. Anti-B: anti-B are plasma antibodies found in type A blood; again, not RBC antigens.
E. A and B: type AB individuals have both A and B antigens on their RBC surfaces (and typically have no anti-A or anti-B antibodies in their plasma).
Correct Answer is D
Explanation
A. initiate blood clotting: Platelets and coagulation factors initiate clotting; erythrocytes do not initiate clot formation.
B. transport nutrients: Plasma carries most nutrients (glucose, amino acids, lipids), not erythrocytes.
C. defend the body against pathogens: White blood cells (leukocytes) are the main defenders; erythrocytes do not have immune functions.
D. transport some carbon dioxide: Erythrocytes carry a portion of CO₂ (dissolved as bicarbonate via carbonic anhydrase inside RBCs and also some carbaminohemoglobin).
E. regulate erythropoiesis: Erythropoiesis is regulated mainly by erythropoietin (from kidneys) and iron/nutritional signals, not by erythrocytes themselves.
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