BIOL 243 Lecture Notes - Lecture 2: Nitrogenous Base, Cytosine, Guanine
Document Summary
The only different between rna and dna is that 2-deoxyribose is missing the oxygen on the ribose"s c-2" (hence the name deoxyribose). Nitrogenous bases of dna are adenine, thymine, cytosine, and guanine. Nitrogenous bases of rna are adenine, uracil, cytosine, and guanine. Nucleotides formed by a removal of water: the phosphate group is attached to c-5" of ribose and deoxyribose sugar. The nitrogenous base is attached to the c-1". Nucleic acids are polymerized nucleotide monomers via phosphodiester bonds (c-o-p- Polynucleotides: covalent bonds formed between the phosphate and the c-5" and c-3" of two pentose sugars. (the pentose-phosphate backbone) The only variation in polynucleotides occurs with the bases (this provides the code) Erwin chargaff analyzed the quantities of each nitrogenous base in organisms and found: (%a + %g) = (%c + %t) X-ray images produced by rosalind franklin led to watson"s discovery that: due to . 34nm periodicity, it appears bases are stacked like pennies ontop of another.