Answer :
Final answer:
The rough ER is responsible for synthesizing membrane proteins crucial for building cellular membranes.
Explanation:
Rough ER is responsible for protein synthesis, especially membrane proteins, due to the ribosomes present on its surface. These proteins are crucial for building cellular membranes. The rough ER plays a vital role in incorporating membrane proteins into the ER membrane and aiding in the formation of other cellular membranes.
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