A large molecule consisting of many repeating chemical units linked together.

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Multiple Choice

A large molecule consisting of many repeating chemical units linked together.

Explanation:
A macromolecule is a very large molecule built from many smaller subunits. In biology, these subunits are called monomers, and when many are linked together you get polymers—chains of repeating units. The description “a large molecule consisting of many repeating chemical units linked together” points to this broad category, since it encompasses proteins, nucleic acids, and polysaccharides, all of which are polymers and all of which are macromolecules. The other options name specific examples (nucleic acid, polypeptide) or the specific class of large molecules formed from repeating units (polymer). The statement describes the general category that includes these examples, making macromolecule the best fit.

A macromolecule is a very large molecule built from many smaller subunits. In biology, these subunits are called monomers, and when many are linked together you get polymers—chains of repeating units. The description “a large molecule consisting of many repeating chemical units linked together” points to this broad category, since it encompasses proteins, nucleic acids, and polysaccharides, all of which are polymers and all of which are macromolecules. The other options name specific examples (nucleic acid, polypeptide) or the specific class of large molecules formed from repeating units (polymer). The statement describes the general category that includes these examples, making macromolecule the best fit.

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