A scientist is examining the function of macromolecules in a cell. She notices that movement of large molecules into and out of the cell is disrupted when she damages one specific type of macromolecule. Which macromolecule has she most likely damaged?

Proteins in the cell membrane, such as channel and carrier proteins, help large molecules move into and out of the cell. Damaging these proteins can disrupt that transport. A steroid can be part of the membrane, but it does not typically transport large molecules across it, so the answer is a protein.

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