B5 Growth and Development OCR 21st Century Science

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  • DNA is a double Helix: two strands coiled together
    • each strand-small units, NUCLEOTIDE
      • contains a small molecule called a base
        • DNA has 4 - Adenine (A), Cytosine (C), Guanine (G), Thymine (T)
          • two strands are held together by the bases, which bind in pairs


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