nucleotides

• what are nucleic acids

  polymers of nucleotides
• what are the three sections of a nucleotide

  phosphate group , pentose sugar and a nitrogenous base
• what are the two types of nitrogenous base

  purines and pyrimidines
• what is a purine base

  double ring base
• which bases are purine bases

  Adenine and Guanine
• What is a pyrimidine base ?

  single ring base
• which bases are pyrimidine bases

  uracil , thymine and cytosine
• What is Chargaff's rule?

  DNA should have a 1:1 ratio(G=C, A=T)
• What does a pyrimidine look like?

  
• what does a purine look like