BISC207 Lecture Notes - Lecture 5: Thymine, X-Ray Crystallography, Francis Crick
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BISC207 Full Course Notes
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Document Summary
A nucleic acid is a polymer of nucleotide monomer. Three components of a nucleotide: a phosphate group, 5-carbon sugar, a nitrogenous (nitrogen-containing) base. Both the phosphate group and the nitrogenous base are bonded to the sugar molecule. Has an -oh group bonded to the 2" carbon. Has an h instead at the 2" carbon. There are two groups of nitrogenous bases: Purines: contain nine atoms in their two rings. Pyrimidines: contain six atoms in their one rings. Phosphate is bonded to the 5" carbon, sugar is bonded to the 1" carbon. Nucleic acids form when nucleotides polymerize via condensation reactions. The phosphate group on the 5" carbon of one nucleotide. And the -oh group on the 3" carbon of another. Deoxyribonucleic acid (dna) stores genetic information in modern cells. Most researchers think ribonucleic acid (rna) was the first life molecule. Proposes that rna both stored genetic information and catalyzed its own replication.