BSC-2010 Study Guide - Final Guide: Centrosome, Nucleolus, Franklin Stahl

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4 May 2017
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Chapters 1-2: biosphere, ecosystems, communities, populations, organisms, organs and organ systems, tissues, cells, organelles, molecules. All life is built from combinations of chemical elements. Understand atomic structure and how it determines the properties of chemical elements. An element is a substance that cannot be broken down to other substances by chemical reactions. A compound is a substance consisting of two or more elements in a fixed ratio. A compound has characteristics different from those of its elements. Isotopes are two atoms of the same element with different numbers of neutrons in their nuclei. Electrons are not always shared equally between two atoms in a covalent bond. Highly electronegative atoms have a stronger attraction to electrons and pull shared electrons closer to their nucleus. Non-polar covalent bond electrons are shared equally (carbon and hydrogen have very similar electronegativity) Polar covalent bond electrons are shared unequally (oxygen is much more electronegative than.

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