Kaplan

• The bases of DNA pair up via hydrogen bonds.
• DNA and RNA are negatively charged.
• DNA is double stranded
• RNA is single-stranded.
• Purines: adenine and guanine
• Pyrimidines: cytosine, thymine, and uracil.
• Thymine is only found in DNA
• Uracil is only found in RNA.
• Aromatic molecules are fairly unreactive because of their delocalization characteristic.
• Adenine and Thymine are held together by 2 hydrogen bonds.
• Cytosine and Guanine are held together by 3 hydrogen bonds.