NUTRITION
CARBOHYDRATES
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
It is required as a precursor to synthesise DNA and proteins.
|
|
|
It provides the structural material for cell walls.
|
|
|
It acts as dietary fibre to help move food through the digestive system more quickly.
|
|
|
It acts as a storage source for energy.
|
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: -Why is it impossible for humans to digest food that contains cellulose? There is no energy available in fiber. An inactive form of cellulase in human digestive tract renders it undigested and removes it as waste. The acidic environment in the human stomach makes it impossible to break the bonds in cellulose.
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.