DNA

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  • Created by: G-girl
  • Created on: 08-12-12 18:38
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  • 2. DNA uncoils
  • DNA
    • PROTEIN SYNTHESIS
      • TRANSLATION (occurs at ribosome in cytoplasm)
        • 1. tRNA carry amino acids to ribosome
        • 2. tRNA attach to mRNA through complementary base pairing
          • 3. Two amino acids joined by   peptide bonds
            • 4. tRNA moves away, leaving amino acid behind
              • 5. Polypeptide chain formed
                • 6. Polypeptide chain moves away, translation is complete
      • TRANSCRIPTION (occurs in nucleus)
    • DNA= 2 polynucleotide strands, deoxyribose sugar
      • RNA= 1 polynucleotide strand, ribose sugar
    • two complementary base pairs join by hydrogen bonding between the bases.
      • 2 DNA strands wind up to form the DNA double helix
    • MONO-NUCLEOTIDE
      • MONO NUCLEOTIDE  = pentose sugar, phosphate group, nitrogenous base
      • joined through condensation reactions between the phosphate group and the sugar group. Water is a by-product in condensation reaction
    • SELF-REPLICATION
      • 1. Hydrogen bonds break
        • 2. DNA helix uncoils
          • 3. DNA strand used as a template
            • 4. Mononucleotide joins template strand by complementary base pairing
              • 5. Mononucleotide on new strand joined together by the enzyme DNA polymerase
                • 6. Hydrogen bonds form between the bases
                  • 7. each new strand contains 1 original and 1 new strand
    • BASES
      • Guanine
      • Thymine (replaced by Uracil in RNA)
      • Cytosine
      • Adenine
      • bases join by complementary base paring (A-T) (C-G)
    • Untitled
    • MESELSON & STAHL
      • 1. two samples  grown. 1 light, 1 heavy

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