Choose all the true statements about protein digestion and hydrolysis.
a. Hydrochloric acid, present in gastric juices, causes protein denaturation.
b. Pancreatic juices are more acidic than gastric juices.
c. The chemical digestion of proteins begins in the mouth with the process of mastication.
d. Absorption of free amino acids occurs through the wall of the stomach. In the small intestine chymotrypsin attacks peptide bonds.
Answer:- All the correct answers are as follows:
a. Protein denaturation is caused by hydrochloric acid in gastric juices.
c. Proteins begin to be chemically digested in the mouth through the process of mastication.
d. Chymotrypsin, in the small intestine attacks peptide bonds.
Explanation:
Option a is true. Hydrochloric acid in the gastric juices causes proteins to uncoil, making them available for digestion by enzymes.
Option b is false. Pancreatic juices are basic and not acid.
Option c is true. As chewing begins in the mouth, mechanical processes begin breaking down proteins.
The first part of option d is wrong – amino acids are absorbed with the small intestine not in stomach. Although, the second is true – chymotrypsin does attack peptide bonds between amino acids in small intestine .
Hence, the true statements are a, c and second part of d.
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