05_Life08 - Building Blocks of Life 25 January 2008 Lecture...

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25 January 2008 Lecture Objectives: 2. Understand the levels of the trophic pyramid  1. Be introduced to matter and energy  3.  Recognize the importance of Carbon, Nitrogen and  Phosphorus and their biogeochemical cycles Building Blocks of Life  http://www.cnn.com/2008/TECH/science/01/23/biofuels.fears.ap/index.html  
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Principles of Matter and Energy Matter  - Has mass and takes up space. Three phases Liquid Solid Gas water Energy   - The capacity to do work. Heat   - Energy that can be transferred between  objects of different temperature.
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Atom     Fundamental unit of matter.  92 kinds of atoms (elements) in nature (plus several others that have  been synthesized)
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Isotope  - Atoms of a single  element that differ in atomic mass  (protons and neutrons). Stable isotopes  –  Isotopes that do not  radioactively decay Radioactive isotopes  -   spontaneously decay or shed  subatomic particles. 12 C (6 protons, 6  neutrons)  13 C (6 protons, 7  neutrons) 14 C (6 protons, 8  neutrons) Carbon Isotopes
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The elements that we care most about are: Carbon - C Nitrogen - N Phosphorus - P Oxygen - O Hydrogen - H
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Molecules   — Atoms bonded together into stable units. Compounds  –  molecules made  up of more than  one element
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Organic compounds  –   Compounds that make up living  things  Inorganic compounds  – Do not contain carbon-hydrogen  bonds Examples Carbon dioxide (CO 2 ) Salt (NaCl)
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Carbon dioxide
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05_Life08 - Building Blocks of Life 25 January 2008 Lecture...

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