VPY-0098
QUESTION
Hb4O3 have Iron in?
OPTIONS
(A) Fe++
(B) Fe+++
(C) Both (a) and (a)
(D) None of these
ANSWER
(A) Fe++
EXPLANATION
Fe++ is the correct option because the iron in functional hemoglobin is in the ferrous Fe2+ state, which allows reversible binding of oxygen to the heme iron. Fe3+ forms methemoglobin, which cannot bind oxygen normally, and the remaining alternatives therefore do not correctly describe the iron state in functional hemoglobin.
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