lecture 18 - BIO 311C Some General Differences Between...

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Unformatted text preview: BIO 311C February 27, 2008 Some General Differences Between Polypeptides and Polysaccharides Polysaccharides usually have a regular repeating pattern of subunits, while very few polypeptides do. Many polysaccharides occur as branched polymers while polypeptides never do. Polysaccharides associate with each other and with other kinds of molecules mostly by hydrogen bonding. Polypeptides utilize a variety of different kinds of bonding to associate with each other and with other kinds of molecules. Polypeptides perform a much more diverse range of functions in cells than do polysaccharides. * phosphodiester bonds I llustration of a Polynucleotide Chain nucleotides 5' terminal end of molecule 3' terminal end of molecule Polynucleotide chains are un-branched polymers. The subunits of polynucleotide chains are nucleotides. The bonds between nucleotides are phosphodiester bonds. Polynucleotide chains have two distinct ends, a 5' end and a 3' end. The relationship between a polynucleotide chain and nucleic acid is homologous to the relationship between a polypeptide chain and a protein. * 5' 3' A nucleoside is a nitrogen base covalently bonded to a pentose sugar....
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lecture 18 - BIO 311C Some General Differences Between...

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