This post is about nucleosides, nucleotides, and nucleic acids. It is often confusing for students to remember and tell the differences between them. Let's look at what they are. A nitrogenous base, sugar, which can be either deoxyribose or ribose sugar, and phosphate are building blocks of nucleic acids, DNA, and RNA. Nitrogenous bases are  Adenine, Guanine, Cytosine, Thymine, and Uracil Among these bases, Adenine and guanine are known as Purines. Similarly, Cytosine, Uracil, and Thymine are Pyrimidines. How to remember them?  The Mnemonic is "Pure as gold." for purines and C, U, T, for pyrimidines. When these bases are combined with sugar, they are then known as nucleosides, "Remember sides with sugar! " Nucleosides have names either ending in "sines" or "dines" Adenosine,  Guanosine, Cytidine, Thymidine, Uridine. When phosphate is added to nucleosides, it gives nucleotides. Remember " Tides with Phosphate " These can be monopho...