Ch_03_Lecture_1[1]

Ch_03_Lecture_1[1] - 1 Chapter 3 The Molecules of Cells 2...

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Unformatted text preview: 1 Chapter 3 The Molecules of Cells 2 Got Lactose? • Many people in the world suffer from lactose (milk sugar) intolerance. Why? – Lacking an enzyme ( lactase ) that digests lactose Lactose glucose (C 6 H 12 O 6 ) galactose (C 6 H 12 O 6 ) + 3 • Lactose intolerance illustrates the importance of biological molecules – To the functioning of living cells and to human health There is a biological explanation to “One man’s meat is another man’s poison”…… 4 INTRODUCTION TO ORGANIC COMPOUNDS 3.1 Life’s molecular diversity is based on the properties of carbon • A carbon atom can form four covalent bonds – Allowing it to build large and diverse organic compounds Structural formula Methane H H H H H H H H Ball-and-stick model Space-filling model C C The 4 single bonds of carbon point to the corners of a tetrahedron. single bond 2 shared electrons “─” double bond 4 shared electrons “═” triple bond 6 shared electrons “≡” 5 • Carbon chains vary in many ways H H H H H H Ethane Propane H H H H H H H H H H Carbon skeletons vary in length. H H H H H H H H H H H H H H H H H H H H H H H H H H H C H H H H H H H H H H H H H H H H H H H H H H Butane Isobutane Skeletons may be unbranched or branched....
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This note was uploaded on 04/07/2008 for the course BIO 100 taught by Professor Zhongma during the Spring '08 term at Truman State.

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Ch_03_Lecture_1[1] - 1 Chapter 3 The Molecules of Cells 2...

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