Nucleotides and Nucleic Acids DNA Sugar component is 2'-deoxyribose (the prefix 2'-deoxy indicates that oxygen is missing from the 2'position of ribose) Contains four different amino bases Two substituted purines (adenine and guanine) Two substituted pyrimidines(cytosine and thymine) RNA Sugar component is ribose Contains adenine,guanine,and cytosine Thymine is replaced by a closely related pyrimidine base called uracilDNA ▪ Sugar component is 2′-deoxyribose (the prefix 2′-deoxy indicates that oxygen is missing from the 2′ position of ribose) ▪ Contains four different amino bases ▪ Two substituted purines (adenine and guanine) ▪ Two substituted pyrimidines (cytosine and thymine) RNA ▪ Sugar component is ribose ▪ Contains adenine, guanine, and cytosine ▪ Thymine is replaced by a closely related pyrimidine base called uracil Nucleotides and Nucleic Acids