GEN-3000 Lecture 9: 9 – DNA Structure and Analysis
21 Oct 2020
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5: life cycle of a t-even bacteriophage. The electron micrograph shows an e. coli cell during infection by numerous t2 phages (shown in blue). Species (in picograms): * sperm (n) and nucleated precursors to red blood cells (2n) were used to contrast ploidy levels. 11: (a) chemical structures of the pyrimidines and purines that serve as the nitrogenous bases in r n a and d n a. (b) 13: nucleoside with phosphate group added, basic structures of nucleoside diphosphates and triphosphates. 5" (3"-5") phosphodiester bond, producing a dinucleotide: (b) shorthand notation for a polynucleotide chain, oligonucleotides, short chains consisting of around 20 nucleotides, longer chains are called polynucleotides, store vast amounts of genetic information. 15: give rise to extraordinary variation, base-composition studies, chargaff chromatographic methods used to separate the four. The strong arcs on the periphery show closely spaced aspects of the molecule, providing an estimate of the periodicity of. 16 nitrogenous bases, which are 3. 4 apart.
