Cellulose-rich foods are considered essential components of a balanced diet of humans. Which one of the following statements is true about cellulose?
1
Humans do not have cellulose digestive enzymes.
2
Cellulose is a type of carbohydrate, which is absorbed in the human body and provides energy.
3
Cellulose is easily broken down into smaller components, which are expelled as roughage.
4
Cellulose digestive bacteria present in humans convert cellulose into fibers.