What can humans NOT digest?

Correct option is A

The correct answer is (a) Cellulose.
· Humans cannot digest cellulose because they lack the enzyme cellulase, which is necessary to break down cellulose into glucose molecules.
· Cellulose is a complex carbohydrate found in the cell walls of plants, and it serves as a source of dietary fiber in the human diet, aiding in digestion but not providing nutrients.
· While cellulose passes through the digestive system largely intact, it helps promote bowel health and regularity.
Information Booster:
· Starch: Humans can digest starch through the action of enzymes like amylase and maltase, which break it down into glucose molecules.
· Glycogen: Humans can digest glycogen, the stored form of glucose in the liver and muscles, through the enzyme glycogen phosphorylase, converting it back into glucose.
· Amino Acids: Amino acids are the building blocks of proteins, and humans can digest proteins through the action of proteases, breaking them down into amino acids for absorption and use in the body.