Question

Which of the following statements is incorrect regarding digestion of proteins?

• A. Proteins are hydrolysed to peptones in mouth by amylase
• B. Proteins are hydrolysed to peptones in stomach by pepsin
• C. The peptones are broken to peptides in the intestine by trypsin
• D. The peptides are further broken to amino acids in the intestine by peptidase

Answer 1

Answer: (A)

Proteins $\xrightarrow[\text{(Stomach)}]{\text{Pepsin}+HCl}$ Peptones $\xrightarrow[\text{(intestine)}]{\text{Trypsin}}$ Peptidies $\xrightarrow[\text{(intestine)}]{\text{Peptidase}}$ Amino acids
Hence choices (b), (c) and (d) are correct. (a) is incorrect because in mouth by amylase only polysaccharides are hydrolysed to disaccharides.