Which organelle is characterized ultrastructurally by a network of membrane-bound tubules and cisternae, some of which are studded with ribosomes?
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Correct answer: Rough endoplasmic reticulum (rER)
Rough endoplasmic reticulum (rER) is a membranous network whose cisternae have ribosomes on their cytosolic surface, giving a 'rough' appearance under EM; it is involved in synthesis of secretory and membrane proteins.
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