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BIO 121 - September 16th

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Syracuse University
BIO 121
Jason Wiles

BIO 121, September 16th Class Notes See figure 3.3 NucleicAcids • Polymers are made of nucleotides • Nitrogenous base, makes different from each other • 2-ring purine or 1-ring pyrimidine • Pyrimidines: Cytosine (C) Thymine (T) Uracil (U), one rings • Purines:Adenine (A), Guanine (G), two rings • All nucleotides have a five-carbon sugar • Ribose or deoxyribose One or more phosphate groups • • DNAand RNA • Long chains of nucleotides • RNA- single strand, phosphate group, nitrogenous base • DNA- double strand • Store and transfer information • Sequence of amino acids in proteins • Structure and function of the organisms • Send information from one to the next • Offspring • Other Kinds of Nucleotides • ATP (adenosine triphosphate) • Essential in energy metabolism NAD+ • • Electron acceptor in biological oxidation and reduction reactions Key Concept: NucleicAcids Nucleic acids (DNAand RNA) are informational molecules composed of long chains of nucleotide subunits.ATP and some other nucleotides have a central role in energy metabolism. Biological Membranes and Diffusion Diffusion • Net movement of substance down its concentration gradient • From region of greater concentration to equilibrium • To region of lower concentration • Does not use direct metabolic energy
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