Question

The substance that does not directly participate in human digestion is

• A. Nucleotides
• B. Enterokinase
• C. Bile salts
• D. Dipeptides

Answer 1

The correct option is B

Enterokinase

The correct option is (C)

Explanation of correct option:

1. Enterokinase does not directly participate in the digestion process.
2. It essentially activates inactive enzymes such as trypsinogen into trypsin. Trypsin thereafter is involved in the digestion of proteins.

Explanation of incorrect option:

Option (A):

1. The nucleotides produced by the action of protein-digesting enzymes are further broken down via nucleosidase.

Option (C):

1. Bile salts in the bile juice act upon the large fat molecules and break them down into small fat droplets which is known as emulsification.

Option (D):

1. Dipeptides are digested within the small intestine by the action of pancreatic juices and enzymes within it.

Final answer:

The substance that does not directly participate in human digestion is enterokinase.