Humans cannot digest cellulose because they
- A. find it toxic
- B. digest it before it reaches the stomach
- C. absorb it without digestion
- D. lack the enzyme cellulase
Explanation
The beta glycosidic bonds of cellulose need cellulase, which human cells do not produce, so it passes through as fibre. Ruminants rely on symbiotic microbes that supply the enzyme for them.
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