GCD 3022 Lecture Notes - Lecture 6: Enterobacteria Phage T2, Beta Helix, Cytosine

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9. 1 identification of dna as the genetic material. To fulfill its role, genetic material must meet four criteria: information, transmission, replication and variation. Griffith showed that the genetic material from type s bacteria could transform type r bacteria into type s. Avery, macleod, and mccarty discovered that the transforming substance is. Hershey and chase determined that the genetic material of t2 phage is dna. 9. 2 overview of dna and rna structure. Dna and rna are types of nucleic acids. In dna, nucleotides are linked together to form strands, which then form a double helix that is found within chromosomes. A nucleotide is composed of one or more phosphates, a sugar and a base. The purine bases are adenine and guanine, whereas the pyrimidine bases are thymine (dna only), cytosine, and uracil (rna only) In a dna strand, nucleotides are covalently attached to one another via phosphodiester linkages.

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