Question

Identify labels A and B in the following chemical reactions and select the correct option given below.
i) Pepsinogen (inactive enzyme) $\xrightarrow{\text{A}}$ Pepsin (active enzyme)
ii) Proteins $\xrightarrow[\text{acidic medium}]{\text{B}}$ Peptones + Proteoses

• A. A--mucus, B--chymotrypsin
• B. A--ptyalin, B--trypsin
• C. A--HCl, B--pepsin
• D. A--HCl, B--ptyalin

Hint:

{HCl activates pepsinogen → pepsin digests proteins}.

Answer 1

The Correct Option is C

Step 1: Activation of pepsinogen.
Pepsinogen is converted into active pepsin in the presence of hydrochloric acid (HCl) in the stomach.
Step 2: Protein digestion.
In acidic medium, pepsin digests proteins into peptones and proteoses.
Step 3: Correct identification.
Thus, A is HCl and B is pepsin.