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ï§Carbon-based molecules are called organic compounds. ï§â¯By sharing electrons, carbon can ââ¯bond to four other atoms and ââ¯branch in up to four directions. ï§â¯compounds composed of only carbon and hydrogen are called hydrocarbons. ï§â¯A carbon skeleton is a chain of carbon atoms that can be ââ¯branched or ââ¯unbranched.
Lipids are molecules defined by several characteristics, the chief of which is their avoidance of water -- referred to as their nonpolar nature. Lipids are then divided into two categories. One category contains molecules that are long chains of carbon atoms accompanied by hydrogen atoms, such as fatty acids. The other category is molecules in which carbon atoms are attached as multiple ring structures that are fused together, such as cholesterol.