BIO 121 Lecture Notes - Lecture 21: Hydrophile, Organic Compound, Electronegativity

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23 Nov 2020
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Carbon is the single most abundant element of life. It is neither strongly electronegative nor positive. It has 4 electrons in its valence shell. It can make 4 bonds: either with other carbon atoms (making chains or rings) or with hydrogen and other atoms (tetrahedral) The diversity of carbon-carbon interactions provides for the diversity of biomolecules: lipid, carbohydrate, protein, nucleic acid. Carbon to carbon bonds are strong bonds, however they are not so strong that it would be impossible for cells to break them. Hydrocarbons can exist as unbranched or branched chains, or as rings. Co2 molecule for example is linear, with 2 double bonds connecting c to o on either side. Oxygen atoms pull on electrons in a linear manner and so carbon dioxide is nonpolar. The shape of a molecule is important in determining its biological properties and function.

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