Discussion
Assertion (A): A cell must retrieve certain proteins from the Golgi and return them to the endoplasmic reticulum.
Reason (R): Resident reticulum proteins are constantly swept forward by the flow of vesicles.
Answer: B
Both are true and the reason gives the necessity: bulk forward flow carries residents along with the cargo, so a retrieval signal and a retrograde COPI route are needed to bring them back and keep each compartment's identity.
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