BLG 144 Lecture Notes - Cell Nucleus, Heredity, Uracil

• School: Ryerson University
• Department: Biology
• Course: BLG 144
• Professor: Tsogbadral Galaabaatar

Document Summary

Store heredity information for structural and functional. 2 types: dna (deoxyribonucleic acid, rna (ribonucleic acid) Dna and rna are nucleotide polymers (strands: nitrogenous base + 5c sugar (pentose) + phosphate group = nucleotide. Rna ribose nitrogenous bases strands purines (double-ring) adenine (a) guanine (g) pyrimidines (single-ring) cytosine (c) thymine (t) double purines (double-ring) adenine (a) guanine (g) pyrimidines (single-ring) cytosine (c) uracil (u) Nucleotide strands are joined by phosphodiester linkage (between phosphate group sugar) Strands in dna are held together h-bonds between nitrogenous bases. Bases pair in complimentary fashion: a pairs with t by 2 h-bonds (or u in rna, g pairs with c by 3 h-bonds. Strands are antiparallel (one is inverted compared to the other: note the orientation of the cs which make the linkage. Nucleic acids are read 5" 3". Adenosine triphposphate (atp): delivers e to most rxs in cells. Nicotinamide adenine dinucleotide (nad+) and flavin adenine dinucleotide (fad): used in atp production.