Discussion
Consider the following pairs of substrate and the fermentation product obtained from it:
Molasses - Ethanol
Whey - Single cell protein
Lignocellulosic hydrolysate - Ethanol
Rice husk - Ethanol without pretreatment
How many of the pairs given above are correctly matched?
Answer: D
Correct answer: Only three
Three pairs are right. Molasses ferments to ethanol, whey serves as a substrate for single cell protein, and a lignocellulosic hydrolysate ferments to ethanol.
The fourth is wrong on the crucial qualification. Rice husk cannot be fermented without pretreatment: its cellulose is locked within lignin and, in the husk's case, behind a silica layer as well, so neither yeast nor enzymes can reach it. Pretreatment is not an optional refinement here but a precondition.
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