DNA replication and protein synthesis

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  • Created by: vezting
  • Created on: 28-03-16 11:15
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  • DNA  replication
    • why
      • DNA copies itself before cell divisions so that each new cell has correct amount of DNA
    • replication
      • 1: hydrogen bonds break
      • 2: helix unzips and unwinds
      • 3:each origional strand acts as a template
      • 4: free floating nucleotides pari up with exposed bases by complementary base pairing
      • 5: nucleotides on new strand are joined together by DNA polymerase
      • 6: hydrogen bonds from between old strand and new strand
      • 7: Each new DNA molceule is mad eup of 1 old strand and one new strand
    • protein synthesis
      • 1: mRNA is a copy of a gene, made in the nucleus.
      • 2: at rRNA this is where the proteins are made
      • mRNA attaches/ binds to rRNA
      • tRNA brings a specific amino acid to the mRNA on the rRNA
      • rRNA acts as an enzyme joining the amino acids together
    • genes
      • proteins are made from amino acids
      • DNAcontains genes. the sequence of nucleotides codes for a protein
      • each amino acid is coded by 3 nucleotide bases
    • mutations
      • change in base sequence of the DNA
      • if the sequence in the bases changes, the amino acid it codes for will also be different
      • this may alter the overall prtein and the 3D structure or the way it folds
      • a non-functional protein could be produced

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