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  • Created by: vezting
  • Created on: 28-12-15 10:08
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  • DNA & RNA
    • Basics
      • DNA: double stranded helix with H bonds, deoxyribose sugar, adenine thymine cytosine and guamine
      • RNA: single stranded ribose sugar, adenine uracil cytosine guamine
      • two polynucleotide strands join by H bonds between the complementary base pairs- G-C A-T (U-T)
    • Replication
      • DNA copies itself before a division so that each new cell has the correct amount of DNA, this is important for passing on correct genetic info
      • the process
        • 1: H bonds between polynucleotide strands break, helix unzips leaving 2 strands
        • 2: origional strands acts as templates. free floating nucleotides join exposed bases by complementary base pairing
        • 3: nucelotides are joined by DNA polymerase H bonds re-form
        • 4: each new DNA molecule is made of one old (origional) and one new strand
      • basic transcription/ translation
        • 1: mRNA is a copy of a gene, made in the nucleus, DNA to big to exit via nuclear pore so mRNA is made
        • 2: mRNA reaches rRNA where the proteins are made
        • 3: tRNA binds to specific amino acid and brinds to mRNA on the rRNA
        • 4: rRNA acts as enzyme joining amino acids together with peptide bonds


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