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It consists of a nucleus surrounded by electrons . Atoms form molecules . A molecule is a chemical structure consisting of at least two atoms held together by one or more chemical bonds . Many molecules that are biologically important are macromolecules , large molecules that are typically formed by polymerization -LRB- a polymer is a large molecule that is made by combining smaller units called monomers , which are simpler than macromolecules -RRB- . An example of a macromolecule is deoxyribonucleic acid -LRB- DNA -RRB- , which contains the instructions for the structure and functioning of all living organisms .
Please check all the words that can be used instead of the target word in the same context. Note that the morphology of the target (third person singular, past tense etc.) is considered to be applied to the candidate automatically in the process of paraphrasing.