Rough endoplasmic reticulum (RER)

Definition

The rough endoplasmic reticulum (RER) is a cellular organelle involved in protein synthesis and quality control. It is characterized by the presence of ribosomes on its surface, giving it a 'rough' appearance.

5 Must Know Facts For Your Next Test

1. The RER is an essential part of the endomembrane system, playing a key role in the production and transport of proteins.
2. Ribosomes attached to the RER translate mRNA into polypeptide chains, which are then folded into functional proteins within the RER lumen.
3. Proteins synthesized in the RER are often destined for secretion or for use in lysosomes and cell membranes.
4. The RER works closely with the Golgi apparatus to modify, sort, and package proteins for their final destinations.
5. Malfunctions or diseases affecting the RER can lead to conditions such as cystic fibrosis or protein-folding disorders.

Review Questions

Related terms

Smooth Endoplasmic Reticulum (SER): Lacks ribosomes and is involved in lipid synthesis and detoxification processes.

Golgi Apparatus: Modifies, sorts, and packages proteins from the ER for secretion or use within the cell.

Ribosome: A molecular machine that translates mRNA into polypeptides during protein synthesis.