Directions: In the following questions, a statement of assertion (A) ...
HCl creates an acidic medium, which facilitates activation of pepsinogen into pepsin. The active enzyme pepsin converts proteins into proteoses and peptones.
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Directions: In the following questions, a statement of assertion (A) ...
Assertion (A): HCl converts pepsinogen into active enzyme pepsin.
Reason (R): Pepsin converts protein into proteoses and peptones.
Explanation:
Conversion of pepsinogen into pepsin:
1. Pepsinogen is an inactive enzyme produced by the chief cells in the stomach.
2. When food enters the stomach, the parietal cells in the gastric glands secrete hydrochloric acid (HCl).
3. HCl creates an acidic environment in the stomach, which is necessary for the activation of pepsinogen.
4. HCl converts pepsinogen into its active form, pepsin.
5. This conversion occurs through the process of autocatalysis, where pepsin activates more pepsinogen molecules.
6. Once activated, pepsin can further convert pepsinogen into pepsin, leading to a self-sustaining process.
Conversion of protein into proteoses and peptones:
1. Pepsin, as an active enzyme, plays a crucial role in the digestion of proteins in the stomach.
2. Pepsin breaks down proteins into smaller polypeptides, which are known as proteoses and peptones.
3. Proteoses and peptones are intermediate products of protein digestion.
4. These smaller polypeptides are then further broken down into smaller peptides and amino acids by other enzymes in the small intestine.
Explanation of the Assertion and Reason:
- Both the assertion and reason are true.
- HCl converts pepsinogen into pepsin, which is a well-known fact.
- Pepsin, in turn, converts protein into proteoses and peptones.
- The reason correctly explains the role of pepsin in the digestion of proteins.
Conclusion:
- Both the assertion and reason are true, and the reason is the correct explanation of the assertion.
- Therefore, the correct answer is option 'A' - Both assertion (A) and reason (R) are true, and reason (R) is the correct explanation of assertion (A).
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