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During anaerobic digestion of organic waste, such as in producing biogas, which one of the following is left undegraded?

1. Cellulose
2. Lipids
3. Lignin
4. Hemi-cellulose

Correct answer: Lignin

Solution

Lignin is a complex aromatic polymer that most anaerobic microorganisms cannot efficiently degrade. In biogas production, carbohydrates, proteins, and fats are digested much more readily, while lignin largely remains undegraded.

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