070809condensed - Lecture 07/08/09: Chemistry of Life...

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Lecture 07/08/09: Chemistry of Life Chapter 2: Super-Condensed
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The Atom The most basic unit of matter that retains its own unique properties Made up of three smaller (subatomic) particles
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Atoms and Molecules Atoms come together in some combination to form a molecule
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A Vital Molecule For Life Water makes up 60-70% of the total body weight of most living organisms 6 properties make life possible
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Properties of Water 1.) Water is a liquid at room temperature Small molecules are usually gases at room temperature but water is not Our bodily fluids remain as fluids!
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Properties of Water 2.) Water changes temperature slowly 3.) Liquid water changes to steam very slowly Water must absorb a lot of energy to boil at 100°C and release a lot to freeze at 0°C
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Properties of Water 4.) Solid ice floats on liquid water Ice molecules arrange in a lattice with lots of holes (less dense) Allows aquatic organisms to survive the winter
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Properties of Water 5.) Water is cohesive and flows Molecules cling to surfaces like blood vessel walls 6.) Water dissolves polar molecules For nutrient transport and chemical reactions that take place in cells
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The Molecules of Life In biology, we focus on 4 classes of organic molecules that are vital to life Carbohydrates, lipids, proteins, and nucleic acids
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Not “Organic” Food Not like the advertisements for organic food Compounds that contain mainly carbon and are usually associated with living things
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Macromolecules Macro: large Often contain many smaller molecules ( subunits ) bonded together
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Carbohydrates General formula C(H 2 O) n 1 carbon atom : 2 hydrogen atoms : 1 oxygen atom Hence the name carbon-hydrate C O H H
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General Functions Used by cells for quick bursts of energy and can be stored short-term by organisms
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070809condensed - Lecture 07/08/09: Chemistry of Life...

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