BIO 325 Chapter Notes - Chapter 6: The Double Helix, Z-Dna, Tata Chemicals
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6. 1 experimental evidence for dna as the genetic material. Composed of nucleotides connected via phosphodiester bonds. Polymer = linked chain of building block subunits. Bacterial transformation implicates dna as the genetic material. Bacteria carry genetic material in a single circular chromosome, and the undergo binary fission instead of meiosis. Smooth bacteria appear because they synthesize a polysaccharide capsule. Rough (cid:271)a(cid:272)teria for(cid:373)s spo(cid:374)ta(cid:374)eousl(cid:455) as a (cid:373)uta(cid:374)t of s(cid:373)ooth (cid:271)a(cid:272)teria. Transformation: the ability of a substance to change the genetic characteristics of an organism. Dna as the active agent of transformation: enzymes that degraded rna, protein, or polysaccharides had no effect on the transforming principle but enzymes that degrades dna did. Dna, not protein, contains the instructions for virus propagation. Viruses hijack cost cells by taking control of their growth and replication. The entire phage does not enter the cell it infects. 6. 2 the watson and crick double helix model of dna. Dna is a long polymer composed of nucleotides.
