It contains the NH group which acts as a hydrogen bond owner. And we have the Carbonal group Co that acts as the hydrogen bond acceptor. So what do we mean by that and why is that the case? So let's take a look at one of these amino acids. Let's suppose this amino acid here, the fourth amino acid in our polypeptide chain. So the nitrogen is more electronegative than the H. And what that means is this H will have a partial positive charge, and this partially positive charge on the H will basically ensure that if we have some other atom that is electronegative in close proximity, then in that case, this will be donated to that electronegative atom.