Lecture_7_DulaiS09_Carbs

Lecture_7_DulaiS09_Carbs - Water Carbohydrates Lipids...

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1 Water Carbohydrates Lipids Lecture 7 – Book Sections 2.5-2.6 & 3.1-3.4
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3 Lecture 7 Agenda: Lecture 7 Agenda: The molecules of life II The molecules of life II 2. What is pH? Why is it important? How is it controlled in living systems? 3. What are the 4 major types of biomolecules? What characteristics do they share? 1. What properties of water promote the presence of life on Earth? Why? How? 4. What are functional groups? What do they do? Why are they important? 5. What are carbohydrates and lipids? Why are they important?
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4 So why isn’t there life all over the universe? Could the presence of life have something to do with the fact that Earth is the water planet – 70% of its surface is covered in H 2 O? Earth’s chlorophyll rich surface – the energy sources supporting of life’s complex hiearchy?
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5 WATER WATER
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6 STARTLING FACTS STARTLING FACTS At normal body temperature of, At normal body temperature of, 36.8 36.8 ° ° C C ± ± 0.7 0.7 ° ° C, C, or 98.2 °F ±1.3 °F each and every water molecule each and every water molecule is moving is moving How fast? How fast? 1500 miles per hour! 1500 miles per hour!
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7 Properties of Water Water is a strange compound – But, lucky for us it is or else Weird Density High Boiling Point Very High Specific Heat Cohesion – attracted to other water Surface Tension Adhesion – attracted to other materials
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8 What properties of water make it so conducive to supporting life? •4 reasons – all of which stem from the unique properties of the water molecule itself. What is the key property of the water molecule? • Water is a polar molecule · that forms hydrogen bonds with other water molecules & other polar molecules & ions · repels non-polar molecules; does not form bonds with them
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9 Water is a polar covalent molecule with special properties (because of unique shape and polarity) 9 Molecule has no net charge 9 Oxygen has a slight negative charge 9 Hydrogens have a slight positive charge O H H O H H + _ + + + _ + + Water has the ability to interact with both positive and negative regions of water molecules, ions, and other polar molecules O HH δ - δ + δ +
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10 What two types of substances are recognized based on their molecular interactions with water? 1. Hydrophobic substances · substances composed of non-polar molecules so don’t bond with water molecules · repelled by water because water molecules H-bond with each other excluding the non-polar molecules · Ex. oil mixed into water will eventually separate into two layers
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11 What two types of substances are recognized based on their molecular interactions with water? 2. Hydrophilic substances · substances composed of polar molecules or molecules formed via ionic bonds · H-bonds form between water & oppositely charged parts of molecules/ions Na + Cl + + + + + + + + + + + + + + + + + + Figure 2.10 · spheres of hydration form as water molecules surround charged molecules or ions isolating them from other charged molecules or ions
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This note was uploaded on 11/18/2010 for the course SS 101 taught by Professor Denver during the Spring '10 term at Alabama.

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Lecture_7_DulaiS09_Carbs - Water Carbohydrates Lipids...

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