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B
Duclaux
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C
Buchner
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D
Dubrunfaut
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Solution
The correct option is A Buchner
Biocatalysts were found accidentally in yeast extract by Buchner in 1897. He prepared a yeast extract and added sugar solution to it. After some time he noticed the alcohol formation in the extract which was a sign of fermentation which took in presence of enzyme. Later on, summer crystallized an enzyme known as urease and reported that all enzymes are protein.