ch 5 biological molecules

ch 5 biological molecules - Ch 5 The Structure and function...

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Ch 5 The Structure and function of large biological molecules. Like all parts of this book, function relates to the structure. In this case the function of molecules relates to their structure. 1. Macromolecules are polymers built from monomers a. Polymers are chains of monomers b. By combining a relatively small number of different monomers we make a polymer that can have many different functions. i. This represents another level in the hierarch of biological organization ii. Another example of emergent properties c. Carbohydrates are polymers of sugars d. Proteins are polymers of amino acids e. Nucleic acids are polymers of nucleotides f. Lipids are relatively smaller associations of glycerol and fatty acids, phospholipids or sterols. Their associations are usually much smaller but depend on the commonality of their hydrophobicity. g. Polymers are made by a dehydration reaction i. One group provides the hydroxyl group ii. The other provides the hydrogen h. Polymers are broken apart by hydrolysis i. Enzymes are the catalysts of both reactions. j. The diversity of polymers is that each spot in a sequence can be filled from 20 or so different monomers. 2. Carbohydrates serve the duel purposes of fuel and building material. a. Carbohydrates are sugars and their polymers i. General formula (CH 2 O) n b. Glucose a common monomer is broken down to yield energy in cellular respiration. c.
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ch 5 biological molecules - Ch 5 The Structure and function...

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