DNA

• DNA comprises a double-stranded helix

  • Each strand comprises alternating phosphate and sugar groups
  • One of four bases attaches to each sugar
    • Adenine (A)
    • Thymine (T)
    • Cytosine (C)
    • Guanine (G)
  • (base + sugar + phosphate) group is called a nucleotide

• DNA provides a template for protein synthesis

  • The sequence of nucleotides forms a code

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