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Question

Proteins are broken down into amino acids in ______________.

A
Buccal cavity
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B
Stomach
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C
Intestine
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D
Rectum
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Solution

The correct option is C Intestine
Once a protein source reaches your stomach, hydrochloric acid, and enzymes called proteases to break it down into smaller chains of amino acids.
Amino acids are joined together by peptides, which are broken by proteases.
Digestion of protein is completed in the small intestine by the pancreatic enzymes trypsin, chymotrypsin, and carboxypeptidase. Hence, Proteins are broken down into amino acids completely in Intestine.
So, the correct answer is 'Intestine'.

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