Lecture+7+Web-Bio93-2008

Lecture+7+Web-Bio93-2008 - Lecture 7 Atoms molecules and...

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Lecture 7: Atoms, molecules, and water Friday 10/10/07 Reading Ch 2 pgs 30-43; Ch 3 pgs 46-54
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Unit II: Building the Cell Lecture 7: Atoms, molecules, and water Lecture 8: Carbon, carbohydrates, lipids Lecture 9: Proteins, nucleic acids
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QuickTime  and a TIFF (Uncompressed) decompressor are needed to see this picture. Size Range Figure 6.2 in the textbook 1 m = 1000 mm 1 mm = 1000 µm 1 µm = 1000 nm
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Water is essential for life Cell composition water (70-95%) carbon based compounds (rest)
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Chemical elements and compounds Elements Can’t be broken down into other substance 92 elements, 25 essential for life 96% of living matter is made from 4 elements: C,O,N, H (S, Ca, K, P ~ 4%) Trace elements
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Atoms: smallest units of chemical elements Molecule: Two or more atoms combined Compound: molecule made up of two or more elements combined in a fixed ratio
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Compounds Two or more elements combined in a fixed ratio Atoms combine by chemical bonds Atoms combine by chemical bonds
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