Discussion
Rough endoplasmic reticulum is distinguished from smooth by the presence of
Answer: A
Correct answer: ribosomes bound to its outer surface
The ribosomes are what make it rough, and they are there because the proteins they are making carry a signal sequence directing the whole complex to the membrane. Lipid synthesis, calcium storage and detoxification are functions of the *smooth* reticulum, so a cell’s balance between the two forms tells you what it does - a plasma cell is packed with rough, a steroid-secreting cell with smooth.
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