DNA! spooled gene chromosomes chromatin double helix.

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Presentation transcript:

DNA! spooled gene chromosomes chromatin double helix

1953 Wilkins Franklin Watson Crick

Nucleotides are the monomer of nucleic acids This component varies

nucleotides creates a nucleic acid, a polymer The chain of nucleotides creates a nucleic acid, a polymer

sugar phosphate base pairs covalent bond H-bond N-base

DNA has 4 nucleotides purines pyrimidines

The base pair rule makes the two helices complementary Adenine bonds to Thymine Cytosine bonds to Guanine

DNA is replicated when cells reproduce (mitosis, meiosis) • each old strand acts as a template for a new one • the two stands each contain half of the original Thus replication is semi-conservative http://www.wiley.com/college/pratt/0471393878/student/animations/dna_replication/

RNA is a nucleic acid with a slightly different structure Single helix Ribose sugar vs deoxyribose of DNA * uracil pairs with adenine during RNA synthesis

Function of each differs, but are complementary RNA rewrites and interprets the code multiple types of RNA DNA segments of the sequence - genes - code for proteins