Because the same pH indicator (phenol red) is also used in these fermentation tubes ... Bacteria that have the enzyme tryptophanase, can convert the amino acid, tryptophane to indole. Indole reacts ...
It tests an organism's ability to ferment the sugar glucose as well as its ability to convert the end product of glycolysis, pyruvic acid into gaseous byproducts ... Because the same pH indicator ...
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