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How is a peptide bond formed between two...

How is a peptide bond formed between two amino acida ?

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When - `NH_(2)` group one-Amino acid reacts with - COOH group of another with elimination of a molecule of water .
OR
By a condensation reaction between two-Amino acids with elimination of a molecule of water.
OR
When the basic group or one-Amino acid reacts with acidic group of the other, by eliminating a molecule of water.
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