Multiple Choice
In eukaryotic cells, what is the key difference between rough endoplasmic reticulum (RER) and smooth endoplasmic reticulum (SER) in terms of structure and primary function?
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13. Intracellular Protein Transport
ER Processing and Transport
Multiple Choice
In the context of ER processing and transport, what is the primary function of the rough endoplasmic reticulum (rough ER)?
A
ATP production through oxidative phosphorylation on the inner membrane
B
Synthesis and initial processing (folding and modification) of proteins destined for secretion, membranes, or lysosomes
C
Sorting and packaging of proteins into secretory vesicles for delivery to the plasma membrane or lysosomes
D
Synthesis of most cellular lipids and detoxification of drugs and poisons
Verified step by step guidance1
Identify the main role of the rough endoplasmic reticulum (rough ER) by recalling its structural features, such as the presence of ribosomes on its surface, which are key for protein synthesis.
Understand that the rough ER is involved in the synthesis of proteins that are destined for secretion, incorporation into membranes, or delivery to lysosomes, distinguishing it from other organelles.
Recognize that after synthesis, these proteins undergo initial processing steps in the rough ER, including folding and post-translational modifications like glycosylation.
Differentiate the rough ER's function from that of the smooth ER, which is primarily involved in lipid synthesis and detoxification, and from the Golgi apparatus, which is responsible for sorting and packaging proteins.
Conclude that the primary function of the rough ER is the synthesis and initial processing of proteins destined for secretion, membranes, or lysosomes.
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