BIOL 1000 Lecture Notes - Lecture 1: Subatomic Particle, Iodine Deficiency, Radionuclide
13 May 2017
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Document Summary
Organisms are composed of elements, in combinations called compounds. Matter = anything that occupies space and has a mass (solid, liquid, or gas) . Element = a substance that cannot be broken down to other substances by ordinary chemical means o. 112 unique chemical elements, organized using the periodic table : 92 are found naturally, the remaining are chemically synthesized, symbols consist of first 1 or 2 letters of element"s english, latin, or german name. Molecule = two or more atoms joined together . Compound = consists of 2 or more different elements combined in a fixed ratio . More common than pure elements (few elements exist in pure state) Many are made up of just 2 elements. H2o is the most abundant compound on earth. Compounds have different characteristics than the elements it is made up of. Most compounds in living organisms contain 3-4 elements. Compounds that consist of carbon and hydrogen (& others) = organic compounds.
