Chapter 2

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Unformatted text preview: Bio 20A-M. Dalbey Assigned Reading: The Chemistry of Life (Chapter 2) Chapter 2 Sections 2.1 (p. 21) 2.2 (p. 25) 2.3 (p. 30) 3/29/08 2.1 What are the Chemical Elements the Make Up Living Organisms? Element H C O N P Na* S K* Mg* Cl* Ca* Fe SUM % composition as # atoms in dry weight of a typical cell 54.33 28.55 8.57 6.85 0.66 0.30 0.21 0.18 0.14 0.10 0.09 0.02 99.98 p. 21 The point of this is that the relative abundance of (most) chemical elements in biomass reflects their participation in the covalent structures of the major classes of the biomolecules which we soon encounter in Chap. 3. Other chemical elements (denoted by *) are present as ions in solution and usually not as part of organic molecules. The t...
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This note was uploaded on 04/17/2008 for the course CHEM 1A taught by Professor Roland during the Fall '07 term at University of California, Santa Cruz.

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