BIOMOLECULES AND ENZYMES

Detailed explanation-1: -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-2: -Humans do not have the enzymes needed to break down cellulose ( 1 ). Cellulose is also an insoluble fiber and does not dissolve in water. When consumed, insoluble fibers can help push food through the digestive system and support regular bowel movements (2).

Detailed explanation-3: -There are some animals, such as cows, goats and sheeps which graze grass that have symbiotic bacteria in their abdomen which can digest cellulose. Humans do not have these bacteria nor cellulase, the enzyme needed to break the bonds of cellulose whereas the bacteria in a cow’s gut does produce cellulase.

Detailed explanation-4: -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-5: -So, the correct answer is ‘cellulose’.