Which biological molecule is associated with iron (Fe) ions?
A. Histone
B. Catalase
C. Chlorophyll
D. Hemoglobin
E. RNA polymerase
Answer (2)
D) hemoglobin. It uses the iron ion to attract oxygen.
The biological molecule most associated with iron ions is hemoglobin, which contains heme groups with iron that bind oxygen. Other options like histone, chlorophyll, and RNA polymerase do not contain iron in a similar manner. Thus, the correct answer is D. Hemoglobin.
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