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A molecule of DNA is made of "base pairs"; there are four bases in DNA: Thymine (T), Adenine (A), Cytosine (C), and Guanine (G). In the DNA double-helix thymine and adenine are always paired, and cytosine and guanine are always paired. The sequence of base pairs on a gene are read by molecules in the cell and they serve as instruction to give to the ribosome; the ribosome then assembles the amino acid chain (a protein) based on the "instructions" that it reads from the DNA sequence.

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12y ago

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