Question

During the process of digestion, the proteins present in food materials are hydrolysed to amino acids. The two enzymes involved in the process: Proteins$\underset{}{\overset{enzyme\left(A\right)}{\to }}$ Polypeptides $\underset{}{\overset{enzyme\left(B\right)}{\to }}$ amino acids, are respectively:

• A. invertase and zymase
• B. amylase and maltase
• C. diastase and lipase
• D. pepsin and trypsin

Answer 1

Answer: (D)

pepsin and trypsin

The two enzymes involved in the process are pepsin and trypsin.

$\text{proteins}\stackrel{\text{pepsin (A)}}{\to }\text{polypeptides}\stackrel{\text{trypsin (B)}}{\to }\text{amino acids}$

When pepsin acts on the protein molecule, it breaks the bonds that hold the protein molecule together, called peptide bonds. When these bonds are broken, you get chains of amino acids linked together called polypeptides. Trypsin breaks the polypeptides and peptides into amino acids.