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DNA and RNA - Coggle Diagram

- - - - Both strands are copied
      - Disproved
    - - A DNA strand splits then acts a template to form two new strands
      - Proved
      - Half the molecule (1 strand) is the same as the original
    - - A DNA molecule is cut, copied and joined together again
      - DIsproved
    - - Grew bacteria in different nitrogen isotope environments
        
        They used nitrogen as DNA bases are composed of nitrogen
      - They allowed the Bacteria to multiple to see how many times the heavy nitrogen would be passed on as no new heavy nitrogen could be added and which theory this would support
      - The only theory it supported was semi conservative
- - - - Phosphate group
        
        Provides structure and helps to form phosphodiester bonds
      - Deoxyribose or ribose sugar
      - Nitrogenous Base
        
        A, T, C, G
  - - - Purines
        
        Larger bases with a double carbon ring, bases A and G
      - Pyrimidines
        
        smaller bases with a single carbon ring, bases T and C
      - always a purine with a pyrimidine
- - - - provides structure and helps to form phosphodiester bonds
    - - contains 5 carbon atoms
      - ribose is present in RNA and deoxyribose is present in DNA
    - - Guanine
      - Cytosine
      - Thymine
      - Adenine