General, Organic, and Biological Chemistry Copyright © 2010 Pearson Education, Inc.1 Chapter 21 Nucleic Acids and Protein Synthesis 21.2 Primary Structure.

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General, Organic, and Biological Chemistry Copyright © 2010 Pearson Education, Inc.1 Chapter 21 Nucleic Acids and Protein Synthesis 21.2 Primary Structure of Nucleic Acids

General, Organic, and Biological Chemistry Copyright © 2010 Pearson Education, Inc.2 Primary Structure of Nucleic Acids In the primary structure of nucleic acids,  nucleotides are joined by phosphodiester bonds  the 3′ —OH group of the sugar in one nucleotide forms an ester bond to the phosphate group on the 5′ carbon of the sugar of the next nucleotide

General, Organic, and Biological Chemistry Copyright © 2010 Pearson Education, Inc.3 Primary Structure of Nucleic Acids (continued)

General, Organic, and Biological Chemistry Copyright © 2010 Pearson Education, Inc.4 A nucleic acid polymer  has a free 5′-phosphate group at one end and a free 3′ —OH group at the other end  is read from the free 5′ end, using the letters of the bases  segment shown here is read as: 5′—A—C—G—T—3′ Structure of Nucleic Acids

General, Organic, and Biological Chemistry Copyright © 2010 Pearson Education, Inc.5 Example of RNA The primary structure of RNA  is a single strand of nucleotides  consists of the bases A, C, G, and U linked by 3′—5′ ester bonds between ribose and phosphate