Question

fill in the blank question
the rough endoplasmic reticulum is a major site of protein synthesis thanks to the numerous
that are attached to its membranes.
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Explanation:

In cell biology (a subfield of Biology, which is under Natural Science), the rough endoplasmic reticulum (RER) has ribosomes attached to its membranes. Ribosomes are the cellular structures responsible for protein synthesis, so the presence of numerous ribosomes on the RER makes it a major site for protein synthesis.

Answer:

ribosomes