1. INTRODUCTION TO MACROMOLECULES

1.5. Nucleic acid

Nucleic acids are the large macromolecules in the cells which are very long linear polymers, called polynucleotides.

They composed of nucleotides 

A nucleotide contains:  five-carbon sugar molecules

One or more phosphate groups

A nitrogenous base 

DNA: A, T, G, C  

RNA: A, U, G,C