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Question

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.

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