In human beings, cellulose is digested by ________.

Enzymes

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Symbiotic bacteria

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Symbiotic protozoans

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None of the above

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Solution

The correct option is C None of the above
D. None of the above.
Solution: Cellulases break down the cellulose molecule into monosaccharides. Cellulose breakdown is of considerable economic importance because it makes a major constituent of plants available for consumption and use in chemical reactions. Humans do not have the enzyme cellulase to degrade the beta-1, 4 glycosidic bonds of cellulose. So humans are unable to digest cellulose.
So, the correct answer is option D.

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