Question

Salivary $f\tilde{N}$-amylase becomes inactive in the stomach primarily due to

• A. Degradation by gastric pepsin
• B. Inhibition by $C{l}^{-}$
• C. Inhibition by peptides
• D. Inactive by low pH

Answer 1

Answer: (D)

Inactive by low pH

The pH of the stomach is about 1-2 which is extremely acidic, this acidity causes the salivary amylase's protein structure to denature and change shape. Therefore, salivary amylase becomes inactive in the stomach.

So, the correct option is 'inactive by low PH'.