A bond formed between carboxyl group of one amino acid and amino group of adjacent amino acid, is called
a)	Peptide bond	b)	Hydrogen bond	c)	Covalent bond	d)	All of these

(a)

A peptide bond is a chemical bond formed between two molecules when the carboxyl group of one molecule reacts with the amino group of the other molecule; thereby releasing a molecule of .  This is a dehydration synthesis reaction and usually occurs between amino acids. The resulting bond is a peptide bond and the resulting molecules is an amide.