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B
Miller
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C
Sumner
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D
Wasksman
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Solution
The correct option is D Sumner Most of the enzymes (except catalytic RNA units) are proteins. Protein nature of the enzyme was first established by Sumner. Sumner in 1926 also purified the enzyme urease and obtained it in crystalline form. For this work, Sumner was awarded the nobel prize in 1946.