The structures usually attached to rough endoplasmic reticulum and produce enzymes and other protein compounds are ribosomes.

Here's why:

* Rough endoplasmic reticulum (RER): This organelle is studded with ribosomes, giving it a rough appearance.

* Ribosomes: These are the protein synthesis factories of the cell. They translate genetic information from messenger RNA (mRNA) into proteins.

* Enzymes and other proteins: Ribosomes create a wide variety of proteins, including enzymes that catalyze chemical reactions within the cell.

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