Multiple Choice
In the context of ER processing and transport, what is the primary function of the rough endoplasmic reticulum (rough ER)?
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13. Intracellular Protein Transport
ER Processing and Transport
Multiple Choice
In the context of ER processing and transport, which cellular structure primarily modifies, sorts, and packages proteins for delivery to their final destinations?
A
Peroxisome
B
Mitochondrion
C
Golgi apparatus
D
Nucleolus
Verified step by step guidance1
Identify the role of the Endoplasmic Reticulum (ER) in protein synthesis and initial processing, where proteins are synthesized and folded.
Understand that after synthesis in the ER, proteins need further modification, sorting, and packaging before reaching their final destinations.
Recognize that the Golgi apparatus is the cellular structure responsible for modifying proteins (such as glycosylation), sorting them, and packaging them into vesicles.
Recall that peroxisomes are involved in lipid metabolism and detoxification, mitochondria generate ATP, and the nucleolus is involved in ribosome synthesis, so these do not primarily handle protein modification and sorting.
Conclude that the Golgi apparatus is the correct answer because it functions as the central hub for processing and directing proteins to their proper cellular or extracellular locations.
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