Class10

Class10 - Chemistry 83 Biomolecules Chem 83 will consider...

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Chemistry 83 Class10 1 Chem 83 will consider four types of biomolecules derived from the micromolecules of HCN and H 2 CO Carbohydrates Lipids (fats) Proteins Nucleic Acids All were first produced abiotically (without life) and somehow later combined to form the cell, the basic unit of structure of every living thing. (Oparin) Biomolecules Chemical evolution Frequently a biological molecule is a large molecule made up of repeating units that are linked together. The simplest repeating unit is called a monomer and the large molecule is called a polymer. Micromolecules combined to form larger molecules that combined to form progressively larger molecules. Tro, NJ, Chemistry in Focus, Brooks/Cole, CA, 1998, 456.
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Chemistry 83 Class10 2 Example: polymerization of the micromolecule, formaldehyde H 2 C=O +H 2 C=O HC=O H 2 COH +H 2 C=O HC=O HCOH H 2 COH Monomer Dimer Trimer Process repeats to form progressively larger molecules. It is represented by the general equation, n CH 2 O [CH 2 O] n . Called a carbon hydrate and shortened to carbohydrate. Edible carbohydrates are also called sugars. Carbohydrates Hill/Kolb, "Chemistry for Changing Times", 7th,Prentice Hall, NJ, 19995,456 Carbohydrates are polar molecules capable of H-bonding (water soluble) that contain a carbonyl group (C=O) and several alcohol groups (OH). Names typically end in -ose. For n = 6, there are three common hexoses. Composition: #C-H #O-H
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Class10 3 http://chemistry2.csudh.edu/rpendarvis/3feb23.gif Complexity increases when chains close to form rings The -OH on C-1 and C-4 in same orientation The -OH on C-1 and C-4 in opposite orientat- ions Complexity increases when rings form disaccharides http://www.ualr.edu/botany/sucrose.gif Two monosaccharides (one ring each)
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Class10 - Chemistry 83 Biomolecules Chem 83 will consider...

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