Vitamins and Coenzymes
In the co-enzyme B12the position occupied by a cyanide ion in vitamin B12 is bonded directly to the __________ of the ribose of adenosine.

adenine
5-6 dimethylbenzimidazole
cyanocobalamin
hydroxycobalamin

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Vitamins and Coenzymes
The vitamin riboflavin, which occurs as a yellow pigment in egg yolk and milk become

colorless on reduction with Zn in acid and regained its color on re-oxidation
more deep in color on oxidation and regained its color on reduction with Zn in acid
colorless on oxidation and regained its color on reduction with Zn in acid
more deep in color on reduction with Zn in acid and regained its color on re-oxidation

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