2.2.2 - DNA replication and protein synthesis

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DNA can copy itself by self-replication:

  • Hydrogen bonds between the two polynucleotide DNA strands break. The helix unzips to form two single strands
  • Each original single strand acts as a template for a new strand. Free floating DNA nucleotides join to the exposed bases on each original template strand by complimentary base pairing - A with T and C with G 
  • The nucleotides on the new strand are joined together by the enzyme DNA polymerase. Hydrogen bonds form between the bases on the original and new strand. So each new DNA molecule contains one strand from the original DNA molecule and one new strand

DNA contains genes which are instructions for proteins:

  • A gene is a sequence


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