BIOL 1201 Lecture : Lecture 4

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azuremammoth471

15 Mar 2019

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Biological importance: living cells are 70-95% h20 (most are 90%, solvent for biological reactions (aqueous solution, 71% of earths suface is covered by water (h2o) Polar covalent bonds- atoms of a water molecule are held together. Hydrogen bonds- is between water molecules, producing cohesion. In the formation of h2o, hydrogen atoms become positive because their electrons are being pulled towards oxygen and oxygen becomes negative. Because of this polar nature the hydrogen atoms of one h20 molecule and the. Oxygen atom of another form a hydrogen bond. As water freezes a crystal lattice is formed by hydrogen bonds joining all water molecules in the liquid. In liquid water the breaking of hydrogen bonds results in the water molecules being closer together and more dense. Organisms under water are isolated from the freezing conditions above the water providing a relatively warm and safe conditions. Solutions- a homogenous mixture consisting of a solvent (water) and a solute (molecules and salt) regions)

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The building blocks of carbohydrates are

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osmosis

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The simplest cells are .

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A water molecule is removed from the molecules.

A water molecule is added to the molecules

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COOH

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all statements are differences between DNA and RNA.

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