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A macromolecule that is part of a cell’s external structure is:

Lipid

Nucleic acid

Enzyme

Protein

Proteins are a type of macromolecule that contribute to the external structure of a cell. Lipids and nucleic acids are important for various functions within the cell, but they do not directly contribute to the cell's external structure. Enzymes are also important for cellular processes, but they are not considered a component of the cell's external structure. Therefore, D is the most accurate answer.

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