Nucleic acids - Nucleic acids are polymers composed of...

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Nucleic acids are polymers composed of monomer units known as nucleotides . There are a very few different types of nucleotides. The main functions of nucleotides are information storage (DNA), protein synthesis (RNA), and energy transfers (ATP and NAD). Nucleotides, shown in Figure 22, consist of a sugar, a nitrogenous base, and a phosphate. The sugars are either ribose or deoxyribose. They differ by the lack of one oxygen in deoxyribose. Both are pentoses usually in a ring form. There are five nitrogenous bases. Purines (Adenine and Guanine) are double-ring structures, while pyrimidines (Cytosine, Thymine and Uracil) are single-ringed. Figure 22. Structure of two types of nucleotide. Image from Purves et al., Life: The Science of Biology , 4th Edition, by Sinauer Associates and WH Freeman used with permission. Deoxyribonucleic acid (better known as DNA) is the physical carrier of inheritance for 99% of living organisms. The bases in DNA are C, G, A and T, as shown in Figure 23. We will learn more about the DNA structure and function later in the course
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This note was uploaded on 11/22/2011 for the course CHEMISTRY CHM1025 taught by Professor Laurachoudry during the Fall '10 term at Broward College.

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Nucleic acids - Nucleic acids are polymers composed of...

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