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Unit2essayoutline - 1. Molecular diversity: List the four...

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1. Molecular diversity: List the four classes of biologically important macromolecules and state the subunit (or two subunits, where appropriate) – this can be done in a table . o Protein Amino acid o Carbohydrates Monosacchrides o Lipids Fatty acid Glycerol o Nucleic Acid Nucleotide For the classes of these molecules that we studied in this unit, discuss o the chemical reactions cells use to produce them and degrade them; When a monomer becomes a polymer, it goes through a chemical reaction called dehydration synthesis. During this process a bond is formed because of the removal of one water molecule. The opposite process called hydrolysis occurs when one water molecule is added to a polymer in order to break the bonds. This chemical reaction occurs when a polymer needs to be broken down into a monomer. o what they have in common and how they differ in terms of chemical composition. All of the classes have carbon and hydrogen atoms in their chemical composition. Lipids contain just carbon and hydrogen atoms. A carbohydrate has an extra atom called oxygen. It is in a 1:2:1 ratio. Proteins contain CHNOP and proteins contain CHNOS.
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The difference in atoms are one of the defining characteristics between each class of macromolecules. o the defining structural features or properties of each class, including features that relate to their water solubility (or insolubility), and All of these classes, excluding lipids, are polar because they oxygen or nitrogen atoms exert a strong pull on shared electrons. The polarity tends to make compounds soluable in water. This is necessary condition for their roles in water based life. Proteins Carbohydrates Nucleic acid Lipids insoluable in water due to the equal sharing of electrons making it nonpolar and not charged. o two major functions in a cell of molecules from each class. Proteins cell recognition and have enzymes that help speed up chemical reactions within the cell. Carbohydrates provide energy and structures because the cell wall is composed of them. Lipids Protection and structure Incorporate at least TWO examples of specific molecules (by name) of each class in your discussion. Carbohydrates- c ellulose has dietary fiber for digestion; Starch-polymer of glucose which has long term energy storage in  plants and structure.  It is found on the cell wall and in storage organs Lipids a phospholipid gives structure to a cell because part of the cell membrane is composed of lipids. Waxes are an example of a lipid that provides protection such as on an apple or the ear drum. Proteins
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This note was uploaded on 04/07/2008 for the course BIOL 190 taught by Professor Bruce during the Spring '08 term at Towson.

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Unit2essayoutline - 1. Molecular diversity: List the four...

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