AP BIOLOGY

Detailed explanation-1: -Humans are unable to digest cellulose because we lack appropriate enzymes (cellulase) to break down this complex substance, cellulose. Undigestible cellulose is the fibre which aids in the smooth working of the intestinal tract.

Detailed explanation-2: -Humans cannot digest cellulose because they lack the enzymes essential for breaking the beta-acetyl linkages. The undigested cellulose acts as fibre that aids in the functioning of the intestinal tract.

Detailed explanation-3: -Solution 7: Cellulose (a type of carbohydrate) can be digested by ruminants but not by humans because ruminants have a large sac-like structure called rumen between the oesophagus and the small intestine. The cellulose of the food is digested here by the action of certain bacteria which are not present in humans.

Detailed explanation-4: -In the human body, cellulose cannot be digested due to a lack of appropriate enzymes to break the beta acetal linkages. The human body does not have the digestive mechanism to break the monosaccharide bonds of cellulose.

Detailed explanation-5: -Animals like cows can digest cellulose, but humans cannot.