BIOLOGY 151 Lecture Notes - Lecture 5: Hydroxy Group, Aldehyde, Functional Group

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2 Feb 2016
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When acids dissolve in water, they release h+ (protons) Is 10^-7 lower ph, higher h+ and higher means more acidic. H+ ions can attach to other molecules and change their properties. A buffer is a weak acid and its corresponding base. Molecules in living things: proteins, carbs, lipids, nucleic acids. Most are polymers of smaller molecules called monomers. Carbon- can make up to 4 bonds, and can form nonpolar and polar bonds. Molecules with nonpolar bonds are poorly water soluble. Molecules with polar bonds are more water soluble. C-c and c-h bonds are electrically neutral and nonpolar. Oxygen is more electronegative than carbon; thus, these are polar bonds. Functional group- groups of atoms with special chemical features that are functionally important. Hydrogen bonds with water to help dissolve molecules. Carboxyl- c=o-o-h (cooh)- it is acidic and polar, gives up oh. Cells contain 4 major families of small organic molecules.

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