Salve Regina University
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Historic Site Management Notes for CHP262
Explain the structure of DNA. 
▪ DNA has 2 strands that are held together by hydrogen bond, which are COMPLIMENTARY and not 
identical, which run opposite to one another (aka base pairs) 
▪ DNA strands must run perfectly parallel, and are able to do so from nucleotides 
▪ Purines must always pair with pyrimidines, with matching bases to form complementary pairs 
▪ DNA in humans/mammals is linear, double stranded structure with the nucleotides of each strand 
connected together by phospha...