Which one of the following can not be categorized as metal ion cofactor?
A
Lithium
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B
Selenium
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C
Vanadium
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D
Heme
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Solution
The correct option is D
Heme
Heme or haem is a cofactor consisting of an Fe2+ (ferrous) ion contained in the core of a heterocyclic organic compound called a porphyrin. Although, heme contains Fe2+ ions, the ions are bound to the organic molecule and therefore is not a metal ion cofactor.