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Unformatted text preview: T = Thymine (a base, not a nucleotide) Note that a polynucleotide has structural polarity (5' vs 3') analogous to the C - N structural polarity of a polypeptide. (See the labeling in Figs. 3.24 and 3.25.) Polynucleotides are always elongated by adding new nucleotides onto the 3' end. The 5' end is oldest. Moreover, the 5' end of a gene transcript codes for the N-terminal region of the protein product of that gene. N N N N N : H H δ + δ-O OH HO C O P O O P O O P O O-O-O-O-1' 2' 3' 4' 5' H H ATP ADENINE (Nitrogenous Base) ADENOSINE (Nucleoside) ADENOSINE TRIPHOSPHATE (Nucleotide) Ribose Phosphate X 3 Bio 20A-M. Dalbey Macromolecules 4/2/08 2 of 2 RNA DNA Ribose X Sugar 2’-Deoxyribose X Adenine X X Purine Guanine X X Thymine X Cytosine X X Nitrogenous Base Pyrimidine Uracil X TEXT/SELF-QUIZ p. 66. #1, 3, 4, 9....
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This note was uploaded on 09/15/2011 for the course BIO 20a taught by Professor Dalby during the Spring '08 term at UCSC.
- Spring '08