BIOL 141 Chapter Notes - Chapter 2: Energy Transformation, Spectrophotometry, Protein Structure

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13 Sep 2017
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Chemical evolution: the theory that simple chemical compounds in the early atmosphere and ocean combined via chemical reactions to form larger, more complex substances, eventually leading to the origin of life and the start of biological evolution. 2. 1 atoms, ions, and molecules: the building blocks of chemical evolution. Hydrogen, carbon, nitrogen, and oxygen make up 96% of matter found in organisms today. Two fundamental questions on how simple substances have evolved into more complex structures found in living cells: Atoms are made of protons and neutrons (or a single proton in hydrogen) surrounded by orbiting electrons. Most of an atom"s volume is empty space. Element: a substance consisting of atoms with a specific number of protons; they preserve their identity in chemical reactions. Atomic number: the number of protons in the nucleus of an atom, giving the atom its identity as a particular chemical element. Mass number: the total number of protons and neutrons in the nucleus of an atom.

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