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The endoplasmic reticulum with attached ribosomes is

ANuclear envelope only
BSmooth endoplasmic reticulum (SER)
CRough endoplasmic reticulum (RER)
DMitochondrial outer membrane
Answer & Solution
Correct answer: C. Rough endoplasmic reticulum (RER)
RER bears ribosomes on its cytoplasmic surface and synthesises secretory proteins. SER lacks ribosomes and is the site of lipid synthesis. Both form part of the endomembrane system.
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