BIO 121 Lecture Notes - Lecture 8: Purine, Nucleic Acid Double Helix, Pyrimidine

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1 Feb 2017
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Bio 121 - week 5 lecture 8 (continued) Nucleic acids are inherited information containing molecules that serve as a cell"s genetic material: there are two types of nucleic acids. Nucleic acids dictate protein synthesis: dna serves as a template for synthesizing rna. Transcription: rna serves as a template for synthesizing proteins. Nucleotides are the monomers of nucleic acids: nucleotides are joined together by dehydration reactions, nucleotides are held together within nucleic acids by phosphodiester linkages. A dna nucleotide consists of: a sugar (deoxyribose, a phosphate group (negatively charged, one of four possible nitrogenous bases. An rna nucleotide consists of: a sugar (ribose, a phosphate group (-, one of four poss. nitrogenous bases. Cytosine, thymine, and uracil are single-ringed nitrogenous bases: called pyrimidines, adenine and guanine are double ringed nitrogenous bases. The sugar of one nucleotide is joined to the phosphate group of the next nucleotide: forms a sugar-phosphate backbone .

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