H-Bonding and Our Genetic Code

FIGURE 7.14 The architecture of protein sheets (drawn using SUAO.pdb). Dashed yellowish lines connecting red and blue parts on the left are H-bonds (the hydrogen atoms 

FIGURE 7.15 A strand of DNA (the bases are labeled generically as bases 1-4) on the left-hand side and the double helix structure of DNA (drawn using lFQ2.pdb) on the right-hand side. The bases in the double helix are color-coded and are paired by H-bonding. 

FIGURE 7.16 The base pairing combinations in DNA are A T and C G. The black lines indicate the site of attachment of the base to the carbon atom in the sugar ring. 

Look at the double hehx and marvel at its architectural beauty. 

A sequence of left-handed amino adds whose identities are determined by the sequenrx of codons 

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