The rough endoplasmic reticulum gets its name from:
AFolds in its outer wall
BRibosomes on its surface
CPores across its membrane
DCrystals inside its lumen
Answer & Solution
Correct answer: B. Ribosomes on its surface
1. The name records how the organelle looks under an electron microscope.
2. The rough ER carries ribosomes attached to its cytoplasmic surface.
3. Those ribosomes give it a studded appearance when viewed through an electron microscope.
4. The smooth ER lacks them, which is the whole basis of the rough and smooth distinction.
_Source: OpenStax Biology for AP(R) Courses (CC BY 4.0), Ch 4 'Cell Structure', sections 4.1-4.6_
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