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Nucleic Acids

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  1. Nucleic Acids

  2. Nucleic acids • Two types: a. Deoxyribonucleic acid (DNA-double helix) b. Ribonucleic acid (RNA-single strand) • Nucleic acidsare composed of long chains ofnucleotides

  3. Nucleotides • Parts: phosphate group pentose sugar (5-carbon) nitrogenous bases: adenine (A) thymine (T) DNA only uracil (U) RNA only cytosine (C) guanine (G)

  4. Nucleotide Structure Phosphate Group O O=P-O O C5H2 O N Nitrogenous base (A, G, C, or T) C1 C4 Sugar (deoxyribose) C3 C2

  5. 5 O 3 3 O P P 5 5 C O G 1 3 2 4 4 2 1 3 5 O P P T A 3 5 O O 5 P P 3 DNA - double helix

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