Vitamins and Coenzymes
Vitamins are essential because the organism

can synthesize these compounds partially
None of these
can't synthesize these compounds in the adequate amounts
can't synthesize these compounds at all

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

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

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