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The principal function of rough endoplasmic reticulum is the synthesis of

  • A.ribosomal RNA used for assembling ribosomes
  • B.proteins destined for secretion or membranes
  • C.lipids and the steroid hormones made from them
  • D.adenosine triphosphate for the cell's work

Answer: B

Proteins entering the lumen are folded, checked and modified before travelling onward. Those made on free ribosomes in the cytosol stay in the cytosol instead. The decision is therefore taken very early, as the chain first emerges.

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