- Statement I: Humans lack the enzyme cellulase required to break down the beta-glycosidic bonds in cellulose. Therefore, cellulose passes through the digestive system largely undigested and acts as dietary fiber. This statement is true. - Statement II: Humans have enzymes like salivary amylase (ptyalin) and pancreatic amylase that break down starch (a polysaccharide made of alpha-glucose units). These enzymes are types of diastase (a general term for starch-degrading enzymes). This statement is true. - The ability to digest starch (Statement II) is completely independent of the inability to digest cellulose (Statement I). One process uses amylase (a type of diastase) for alpha bonds in starch, while the other requires cellulase for beta bonds in cellulose, which humans lack.
Given below are two statements: Statement- I: Human body is incapable of digesting cellulose. Statement-II: Starch degrading enzyme, diastase, is found in human body. Choose the correct answer from the code given below:
Asked in UPPCS Prelims 2017 · Topic: Digestive System (Mechanism of Carbohydrate Digestion and Absorption)
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Answer: B. Both (A) and (R) are true but (R) is not the correct explanation of (A).
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