Carbon monoxide is toxic because
A) it is a negative allosteric effector and lowers the affinity of hemoglobin for oxygen.
B) it oxidizes Fe2+ (ferrous) to Fe3+ (ferric) .
C) it reacts chemically with one of the essential amino acid sidechains and inactivates the hemoglobin.
D) it binds competitively to the heme group and thus lowers the amount of oxygen bound.
Correct Answer:
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