BIOLOGY
CARBOHYDRATES
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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It is required as a precursor to synthesise DNA and proteins.
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It provides the structural material for cell walls.
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It acts as dietary fibre to help move food through the digestive system more quickly.
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It acts as a storage source for energy.
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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 cannot digest cellulose, but it is important in the diet as fibre. Fibre assists your digestive system – keeping food moving through the gut and pushing waste out of the body.
Detailed explanation-3: -So, the correct answer is ‘cellulose’.
Detailed explanation-4: -Dietary fiber that is fermented is generally considered to be soluble dietary fiber. However, since bacteria that degrade insoluble dietary fiber, such as cellulose, also exist in humans, as described above, insoluble dietary fiber is slightly degraded by fermentation in the intestinal tract of humans.
Detailed explanation-5: -Cellulose yields D-glucose after complete acid hydrolysis, yet humans are unable to metabolize cellulose as a source of glucose. Our digestive juices lack enzymes that can hydrolyze the -glycosidic linkages found in cellulose, so although we can eat potatoes, we cannot eat grass.