Concept:Proteins are formed through dehydration condensation reactions between amino acids, resulting in a specific amide bond.
Formula:$$ \text{R-COOH} + \text{H}_2\text{N-R'} \rightarrow \text{R-CO-NH-R'} + \text{H}_2\text{O} $$
Solution:- The reaction between the carboxylic acid group (\( \text{-COOH} \)) of one amino acid and the amino group (\( \text{-NH}_2 \)) of a second amino acid releases a water molecule.
- The resulting \( \text{-CO-NH-} \) bond linking the two amino acids is biochemically referred to as a peptide linkage (or peptide bond).
Why other options are incorrect:Ester linkages (\( \text{-COO-} \)) are found in lipids, linking fatty acids to glycerol. Azide (\( \text{-N}_3 \)) and carbide are entirely different chemical groups not found in the protein backbone.
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