Answer:
Peptide bond.
Explanation:
The peptide bonds are polar, planner and partially double bonded in nature. The peptide bond is formed between the carboxylic group of one amino acid and the amino group of other amino acids. This is a condensation reaction, where the OH of carboxylic group pairs with the hydrogen of other amino group forming a water molecule. The water molecule is removed and the carbon atom pairs with nitrogen atom forming the peptide bond. Thus many peptide bonds are formed between more than two amino acids called polypeptides.
