What kind of reaction forms a peptide bond

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 the other molecule releasing a molecule of water (H2O) 
It's a dehydration synthesis reaction (AKA Condensation reaction) and usually occurs between amino acids

Molecules called lipids have long hydrocarbon chains that determine the way they act. they can be fats, oils, or hormones, and even exist in our cell membranes