Lecture+7+Web-Bio93-2008

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

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Unformatted text preview: Lecture 7: Atoms, molecules, and water Friday 10/10/07 Reading Ch 2 pgs 30-43; Ch 3 pgs 46-54 Unit II: Building the Cell • Lecture 7: Atoms, molecules, and water • Lecture 8: Carbon, carbohydrates, lipids • Lecture 9: Proteins, nucleic acids 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 Water is essential for life • Cell composition • water (70-95%) • carbon based compounds (rest) 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 • 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 • Compounds • Two or more elements combined in a fixed ratio • Atoms combine by chemical bonds...
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This note was uploaded on 10/17/2008 for the course BIO SCI 05240 taught by Professor Busciglio during the Fall '08 term at UC Irvine.

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

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