So when we normally draw nucleotides, this is how we portray our nucleotide. So all a nucleotide is it's basically the nucleotide minus the phosphate group. So the way that we define a nucleotide is basically by saying we have a nucleotide that contains at least one phosphate group. Now before we go on to nucleotides, let's mention one more thing about nucleotides. So notice that the bond in a nucleotide that connects these two different molecules is always between carbon number one, one prime on the sugar and on nitrogen found on the base. Now if the base is a purine and that means we have these two fuse rings, then this nitrogen number one will always be bound to carbon number one.