BIOSC-101 Chapter Notes - Chapter 1: Streptococcus Pneumoniae, The Double Helix, Dna Replication
31 Aug 2020
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Document Summary
Characterizing dna sequences can enhance our understanding of genetic history, but it is overshadowed by dna damage and contamination. The double helix of dna is subject to: breakages in one or both strands, inappropriate cross-linking, chemical modification of individual bases. Dna can be maintained" via very cold temperatures, as ancient bacterial dna sequences have been recovered from 500000 year old sections of ice cores. Dna naturally degrades over time, so a dna sequences remaining in a tissue sample are rare and prone to contamination, which is why handling dna needs to be done in a very clean, contaminant free fashion. Proteins were believed to be hereditary molecules because they has 20 types of amino acids vs nucleic acids" 4 nitrogenous bases, so proteins seemed to offer. A po4 group linked to the 5" carbon on the sugar. A nitrogenous base linked to the 1" carbon on the sugar.
