Dna_rna - DNA & RNA Nucleic acids are polymers of...

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Nucleic acids are polymers of nucleotides (see Figure 5.26): A nucleotide consists of three components Pentose sugar (ribose or deoxyribose) Phosphate (PO4-) Nitrogenous base RNA: Ribose DNA: Deoxyribose (see 2' sugar) You should know and recognize the difference between the two Just as the difference between alpha-1 and beta-1 glucose makes a tremendous difference in the structure of polysaccharides, the different sugars in DNA and RNA confer differences in structure and function. alpha-1 glucose: starch, which most organisms can digest beta-1 glucose: cellulose, which few organisms can digest BASES: Two classes of bases: Purines: Adenine, Guanine (two ring structure) Pyrimidines: Cytosine, Thymine (single ring structure) The base is always attached to the number 1’ carbon. The Phosphate group is always attached to the number 5’ carbon. In 1953, Watson and Crick proposed the DOUBLE HELIX model of DNA
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Dna_rna - DNA & RNA Nucleic acids are polymers of...

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