BIOL1006 Lecture Notes - Lecture 5: Phosphodiester Bond, Pentose, Polynucleotide
Document Summary
Deoxyribose is similar in structure to ribose, but it has an. H instead of an oh at the 2 position. Bases can be divided into two categories: purines and pyrimidines. Purines have a double ring structure, and pyrimidines have a single ring. The nitrogenous bases are organic molecules and are so named because they contain carbon and nitrogen. They are bases because they contain an amino group that has the potential of binding an extra hydrogen, and thus, decreasing the hydrogen ion concentration in its environment, making it more basic. Each nucleotide in dna contains one of four possible nitrogenous bases: adenine, guanine cytosine, and thymine. The primary structure of a purine consists of two carbon- nitrogen rings. Cytosine, thymine, and uracil are classified as pyrimidines which have a single carbon-nitrogen ring as their primary structure. Each of these basic carbon-nitrogen rings has different functional groups attached to it.