BI 150 Lecture Notes - Lecture 3: Covalent Bond, Osmosis, Thermoregulation
30 Aug 2019
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Document Summary
Lecture 3- relevant properties of water/seawater, physiological challenges of marine critters. 80-90% of the body volume of most marine organisms. The connection between h and o atoms are via covalent bonds (sharing of electrons). The asymmetrical nature of the shape of water molecule gives it polarity of charge. This has profound implications for its physical and chemical properties that allow life to exist! Responsible for most of the properties that make life possible. Organisms sink more slowly, able to maintain vertical position more efficiently. A lot more energy is required for active movement through water. Pure water at 4 degrees celsius= 1 g/cm3. Density of water increases as temperature decreases, so cold water sinks. 4 degrees celsius, water density decreases, and it starts to float. The result of billions of years of erosion of rocks by atmospheric water. General composition: inorganic compounds (salts, dissolved gases (n2, o2, and co2, organic compounds (from living organisms)
