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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.
which include fats, oils and phospholipids, are not regarded as polymers because they are not linked together in a chain of many repeating identical sub-units. fiGURe 2.2 Three main groups of polymeric organic molecules present in cells. Note the type of monomer that makes up each type of polymer. Examples of polysaccharides include starch, glycogen and chitin; examples of protein groups include enzymes, immunoglobulins and contractile proteins; examples of nucleic acids include DNA and RNA. Sugars Polysaccharides Building blocks of the cell Larger units of the cell MONOMERS POLYMERS