Question

Which of the following is correct chronological order for some enzymes taking part in protein digestion in humans?

• A. Pepsin → Trypsin → Peptidase
• B. Pepsin → Peptidase → Trypsin
• C. Trypsin → Pepsin → Peptidase
• D. Peptidase → Trypsin → Pepsin

Answer 1

The correct option is A Pepsin → Trypsin → Peptidase

Proteins are made up of amino acids.

In stomach, the proteins are broken down into peptones and large peptides by pepsin.

In small intestine, the proteins, peptones and peptides are broken down into dipeptides by trypsin. Dipeptides are again converted into amino acids by peptidases.

Hence, correct sequence is: Pepsin → Trypsin → Peptidase.