01:119:115 Lecture Notes - Lecture 3: Aldehyde, Ketone, Hydrophile

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Biological importance of carbon: living organisms consist mostly of 70-90% water, carbon based compounds; organic compounds, inorganic, carbon chains= skeletons of most organic molecules, hydrocarbons= only carbon and hydrogen (ex. Ch4: nonpolar and uncharged = hydrophobic= insoluble in h20, structure of functional groups is key to molecular function, designated by +r- meaning it is replaceable, any h can be replaced by a functional group -- changes function. Two o"s very close together = very electronegative. H+ proton easily released -- acidic -- carboxylic acids. Carboxyl and amino = building blocks of proteins. Important in structure of certain proteins two-sh groups can react, forming stable cross-link . Phosphate group (r-po4h2) organic phosphate contributes negative charge. Parts of phospholipids and nucleic acids (dna, rna) Aids in control of gene expression, shape and function of sex hormones. Polymer = molecule made of many similar monomers -- building blocks. Three of the four classes of life"s organic molecules form polymers.

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