Humans cannot digest cellulose because they
Correct answer: D. lack the enzyme cellulase
- 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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About Human Digestive System
The human digestive system breaks food into absorbable molecules through mechanical processing, enzyme action and chemical conditions along the alimentary canal. Questions cover the mouth, stomach, small and large intestines, liver, pancreas and associated secretions, including the digestion and absorption of carbohydrates, proteins, lipids, vitamins, minerals and water.
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