So in this lecture we're going to discuss what the nucleotide and nucleotide is and what the difference between these two things things actually is. So let's begin by describing nucleosides. So all a nucleocide is it's this unit. It's a molecule that consists of a sugar molecule attached covalently via a beta glycocitic bond to a base. And this is one example of a nucleocide. So in this particular nucleocide, the sugar is a ribosugar.