03 carbon molecules

03 carbon molecules - Bio 20A-M. Dalbey Assigned Reading:...

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Bio 20A-M. Dalbey Notes of Carbon Molecules 3/29/08 1 of 6 Assigned Reading: Chapter 3 Sections 3.1 p. 3.1 3.2 p. 42 3.1 What Kinds of Molecules Characterize Living Things? p. 40 Typical # of covalent bonds based on their valences: H 1 C 4 O 2 N 3 S 2 P 5 (anomolous) The big 6 elements do not form colvalent bonds indiscriminately amongst themselves. In biomolecules, binding is nearly always restricted to the following partnerships: For example, nitrogen atoms in biomolecules are nearly always bonded to carbons and hydrogens, and rarely if ever bonded to oxygen, sulfur, or phosphotuus. Isomers Structural Isomers It is somewhat frightening to students of organic chemistry that the number of different “possible” molecular structures increases as a hyperfunction of the # of carbon atoms. For molecules with more than a few C atoms the number of possible structures becomes astronomical. Be (mildly) comforted by the fact that only a tiny fraction of all possible molecules actually exist (are created by) living cells. One of the “secrets of life” is the cell’s ability to select which possible structures to synthesize. Still, there are more than enough to overwhelm you. Optical Isomers (stereoisomers; enantiomers)
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03 carbon molecules - Bio 20A-M. Dalbey Assigned Reading:...

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