Why Smooth ER Not involved in the synthesis of proteins

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Which of the following is NOT involved in
the synthesis of proteins?
(a) rough ER
(b) smooth ER
(c) Golgi body
(d) ribosomes 

Answer: (b) smooth ER.

Rough ER is the site for protein synthesis and has ribosomes embedded. Ribosomes on the rough ER
produce proteins that are passed from the cell; the Golgi body then packages them for this purpose. 

Smooth ER is used mainly in the making of lipids and detoxifying enzymes.

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