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Chapter 3 Notes

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BIOL 1020 - CHAPTER 2 LECTURE NOTES Chapter 2: The Chemical Context of Life You must understand chemistry to understand life (and to pass this course)! Elements and Atoms Elements ? substances that cannot be further broken down into other substances (at least by ordinary chemical reactions) every element has a chemical symbol (H for hydrogen, O for oxygen, etc.); this is most familiar from the periodic table Essential elements: elements that an organism needs to live. They are similar along different organism but there is some variation Trace element: elements that are required by an organism in only minute quantities E.g.: Iron (Trace) Oxygen, Hydrogen, Nitrogen, and Carbon(Essential elements)

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