web_L18_10BIO311C - BIO 311C Spring 2010 Exam 2 Next Friday...

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BIO 311C Spring 2010 Lecture 18 – Friday 5 Mar. Exam 2: Next Friday, Mar. 12, in this classroom Textbook Reading Assignments for Exam 2: As assigned for Feb. 15 – Mar. 10 on the Course Schedule Lecture and Presentation slides to be covered on Exam 2: All topics presented after PowerPoint #10 of Lecture 9. Note there is some overlap between the topics that were covered in Exam 1 and those to be covered on Exam 2. Exam 2 covers biological molecules (including water and inorganic ions) and biological membranes. 1
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Information Molecules of Cells Information is stored in cells in the form of DNA. Information is transferred to various locations in cells in the form of RNA. Information is expressed in cells in the form of proteins. 5 *
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Conjugated biological molecules contain more than one class of biological molecule chemically bonded together. Examples: Glycolipid Lipopolysaccharide Lipoprotein Glycoprotein Nucleoprotein Sugar Nucleotide The name of a conjugated molecule indicates the classes of molecules from which it is constructed. * The largest component of a conjugated molecule is indicated as the last part of the name of the molecule. The prefix "glyco" indicates that a portion of the molecule is carbohydrate. 6
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Example of Conjugated Molecules Containing a Simple Sugar * sugar nucleotide A sugar nucleotide lipid sugar A glycolipid protein A glycoprotein sugar 7
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prokaryotic cell animal cell plant cell Biological membranes are essential components of all living cells. Illustrative examples: Two of their most important characteristics are their ability to: 1. physically and chemically separate aqueous spaces from each other, and 2. facilitate the transport of specific kinds of substances from the aqueous space on one side of the membrane to the aqueous space on the other side. * 9
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hydrocarbon hydrophobic bonding * Hydrophobic bonding occurs when a nonpolar molecule or a nonpolar part of a molecule is forced into contact with water. water 14 Van der Waals forces are weak interactions that occur between adjacent atoms, even atoms of nonpolar molecules van der waals interactions
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15 Consider a hydrophobic molecule and the water that surrounds it as a system. Then the lowest energy state of the system is a state that maximizes bonding among the water molecules. This especially includes hydrogen bonds among water molecules. Maximum bonding among polar molecules occurs when hydrophobic portions of
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This note was uploaded on 06/11/2010 for the course BIO 48765 taught by Professor Sathasvian during the Spring '10 term at University of Texas.

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web_L18_10BIO311C - BIO 311C Spring 2010 Exam 2 Next Friday...

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