Bio Lecture 3 - Lecture 3 Guide A ugust 28 NOTE Sta rting...

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Lecture 3 Guide August 28 NOTE: Starting with this lecture, the Study Guides will be in outline form and will require Lecture material to complete. Take good notes. See EXAM 1 READINGS, Chapter 2 (Moodle), Basics Of Biological Molecules Atomic And Molecular Structure Matter – anything that takes up space and has mass Element (see Table 2.1) – substance that cannot be broken down to other substances by chemical reactions Compound – substance that consists of two or more elements combined in a fixed ratio   Atom – made up of protons, electrons, and neutrons
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Atomic number – number of protons Mass number – number of protons and neutrons together Atomic mass – (daltons) weight of a proton or neutron, equals mass numbers Isotopes – same atomic number, different mass number Radioactive Isotopes – nucleus decays, energy & mass are lost Natural Carbon Isotopes (Atomic number = 6) Isotope Abundance 12 C 98% 13 C 1% 14 C trace (radioactive) Natural Potassium Isotopes (Atomic number = 19) Isotope Abundance 39 K 93.3% 40 K
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