RRB Group-D Model Paper 16 with answers for online practice

Cellulose:

• The major component in the rigid cell walls in plants is cellulose.
• Cellulose is a linear polysaccharide polymer with many glucose monosaccharide units.
• The acetal linkage is beta which makes it different from starch.
• This peculiar difference in acetal linkages results in a major difference in digestibility in humans.
• Humans are unable to digest cellulose because the appropriate enzymes to breakdown the beta acetal linkages are lacking.
• Undigestible cellulose is the fiber which aids in the smooth working of the intestinal tract.
• Animals such as cows, horses, sheep, goats, and termites have symbiotic bacteria in the intestinal tract.
• These symbiotic bacteria possess the necessary enzymes to digest cellulose in the GI tract.
• They have the required enzymes for the breakdown or hydrolysis of the cellulose; the animals do not, not even termites, have the correct enzymes.
• No vertebrate can digest cellulose directly.