BioTest1Essay5

BioTest1Essay5 - ESSAY 5 Water was one of the most common...

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ESSAY 5 Water was one of the most common molecules on the surface of the earth as the earth's crust cooled and life evolved. Due to its prevalence, water was in an optimal position to become the biological solvent. What is it about the structure of water that both facilitated its role as solvent and how did this structure influence the evolution/selection of the other specific groups of molecules, such as proteins, lipids, carbohydrates, and ions, that contribute to the structure and function of cells and organisms? Structure of water - polar molecule due to differences in electro negativity of Hydrogen and Oxygen (more E.N.) – Oxygen has a partial negative charge and hydrogens have partially positive charges -Charges attract ions and polar molecules and shield them (hydration shell = ions surrounded and shielded by water molecules) – water soluble proteins have polar or charged R groups – hydrophilic (likes water) *Functional groups influence structure and function of biological molecules as
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This note was uploaded on 04/10/2008 for the course BIOL 103 taught by Professor Neale during the Fall '08 term at Georgetown.

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BioTest1Essay5 - ESSAY 5 Water was one of the most common...

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