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“big molecules” – this term is commonly used to refer to proteins, lipids, nucleic acids, and carbohydrates which can have thousands of atoms connected through strong covalent bonds. Apart from lipids, macromolecules are typically “polymers” – chains made up of similar units (monomers). So, for example, proteins are polymers of amino acids, nucleic acids are polymers of nucleotides, and carbohydrates are polymers of monosaccharides.