Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
ISBN: 9781337408332



Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
ISBN: 9781337408332
Textbook Problem

The enzyme pepsin is activated in the _______.

  1. a. mouth
  2. b. stomach
  3. c. small intestine
  4. d. large intestine

Summary Introduction

Introduction: Pepsin is one of the major digestive enzymes that is produced in the stomach of many animals including humans. The gastric gland present in the stomach secretes hydrochloric acid that activates the pepsinogen into pepsin. The acidic environment in the stomach denatures the proteins and exposes the bonds between them. These bonds are cleaved by the pepsin into smaller fragments known as peptides.


Reason for correct answer: Stomach is the most important organ where digestive processes take place. Pepsins are the enzymes that are highly active in the acidic condition of stomach (because of digestive HCl). They can digest the complex protein molecules by cleaving the peptide bonds present within the protein.

Option b. is given as “stomach”.

Pepsin is an acidic enzyme produced in stomach that breaks down the larger macromolecules of proteins into smaller peptides. Hence, the correct answer is option b.

Reasons for incorrect answer:

Option a. is given as “mouth”. This is incorrect because the mouth is the part where the digestion begins. The food is chewed to break the larger molecules and then it mixes with the saliva. Pepsin is produced in the stomach and is active in acidic condition.

Hence, option a. is incorrect...

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