Carbohydrates are made of carbon, hydrogen and oxygen. They are the main energy source and sometimes used for structural support. The monomers are sugars and they polymerize to form polysaccharides.
Lipids are made mostly of carbon and hydrogen and are used to store energy. They are hydrophobic. They are made of glycerol bonded to three fatty acids.
Proteins help with chemical reactions, cell structure and energy. They are made from chains of amino acid monomers in a specific sequence determined by DNA and RNA.
Nucleic acids store and pass on genetic material. They are made of nucleotide monomers in a specific sequence on strands of DNA or RNA.
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