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Unformatted text preview: OUTLINES FOR BIOLOGY 1201 Section 001 Summer 2008 DR. STEVEN POMARICO Outline 1B CHAPTER 2 CHEMICAL CONTEXT OF LIFE Atomic Structure: SPONCH and the Atom - 2.1.1 >>>>>An understanding of chemistry is important because an interaction between atoms is one of the lowest levels of biological organization.--- matter Anything that has mass and takes up space--- mass The amount of matter in an object--- element A substance that canot be broken down to other substances by chemical reactions Approximately 25 of the elements are essential for life. Of those the most biologically important by percentage are (see table 2.1): S = sulfur ------ P = phosphorous O = oxygen N = nitrogen About 98 C = carbon H = hydrogen ------ K = potassium ------ Ca = calcium Na = sodium Remaining 2% Cl = chlorine Mg = magnesium Trace elements ---- --- Trace elements Those required by an organism in only minute quantities--- atom The smallest unit of matter that still retains the properties of an element CHARACTERISTICS OF ATOMS >>>>>Atoms are made up of subatomic particles. The 3 most stable subatomic particles are: neutrons, protons, and electrons. (see fig 2.4)--- Protons Positive charge, one Dalton, in nucleus--- Neutrons Neutral charge, one Dalton, in nucleus--- Electrons Negative charge, very little mass, in electron clouds...
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This note was uploaded on 09/15/2008 for the course BIOL 1201 taught by Professor Wishtichusen during the Summer '07 term at LSU.
- Summer '07