Question

why human beings do not digest cellulose​

Answer 1

Answer:

Humans cannot digest cellulose as the digestive system of humans do not have cellulase, the enzyme which digests the cellulose. Cellulose is composed of long chains of polymeric polysaccharide carbohydrate.

Answer 2

Answer:

Humans are unable to digest cellulose because the appropriate enzymes to breakdown the beta acetal linkages are lacking. (More on enzyme digestion in a later chapter.) Undigestible cellulose is the fiber which aids in the smooth working of the intestinal tract. ... No vertebrate can digest cellulose directly.