1/18/2016 DNA DNA 'a晋 .Base pairs are specific DNA is composed of Adenine pairs with repeating units of Thymine nucleotides Cytidine pairs with DNA exists in the cell Guanine as a double helix Base of one sequence Strands are held determines sequence of together by hydrogen the other strand.The bonds two strands are thus complementary explains two 9eahus6tb6Sgal information storage DNA structure explains two 1,Linear sequence provides the features of biological biological information information storage storage 2.Maintenance of the code: Four letter alphabet complementary structure allows for precise Provides variety:1000 of duplication of DNA during these letters equals the cell division. average gene size can be arrange in 41000 different ways! .Genetic code is the set of rules that determines how a DNA sequence is converted into an amino acid sequence 31/18/2016 3 • DNA is composed of repeating units of DNA nucleotides • DNA exists in the cell as a double helix •Strands are held together by hydrogen bonds • Base pairs are specific Adenine pairs with Thymine DNA Cytidine pairs with Guanine • Base of one sequence determines sequence of the other strand. The two strands are thus complementary DNA structure explains two features of biological information storage 1. Linear sequence provides the biological information storage • Four letter alphabet • Provides variety: 1000 of these letters equals the average gene size can be arrange in 41000 different ways! • Genetic code is the set of rules that determines how a DNA sequence is converted into an amino acid sequence DNA structure explains two features of biological information storage 2 . M i f h d Maintenance of the code: complementary structure allows for precise duplication of DNA during cell division