What is the function of the rough endoplasmic reticulum (ER) within a cell?
A) Produces proteins
B) Combines protein with other components of the cytoplasm
C) Exports protein from the cell
D) Destroys ribosomes
A
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Many granules that contain enzymes and ribosomes, which produce protein, are scattered over the surface of the rough endoplasmic reticulum. Production of proteins, phospholipids, and cholesterol takes place in the rough endoplasmic reticulum. The rough ER segregates (rather than combines) these proteins from other components of the cytoplasm and modifies their structure for a specific function. Rough ER does not transport anything through the cell membrane. Rough ER is studded with ribosomes; it does not destroy them.
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