Q.14 - Biology

Question

Where does the majority of protein digestion take place?

a. stomach

b. duodenum

c. mouth

d. jejunum

Step-by-Step Solution

Answer

The enzyme pepsin breaks down protein molecules partially to be completely digested by various enzymes in the small intestine.

Hence, 'B' is the correct option.

Step 1. Introduction

In the duodenum part of small intestine, the chyme from stomach is acted upon by enzymes like protease. Polypeptide are broken down into smaller peptides and then into single chains of amino acids. The final products of protein digestion are amino acids.

Step 2. Explanation for the correct option

Two major pancreatic enzymes, Chymotrypsin and trypsin act upon undigested protein molecules by converting them into dipepepties, tripeptides or even amino acids which are later on absorbed in the small intestine.

Step 3. Explanation for the incorrect options

There is no such enzyme found in our buccal cavity that can digest protein. Stomach has pepsin whi h partially breaks down protein but does not completely digest it. In jejunum no enzyme secretion takes place.