Endoplasmic reticulum is involved in all of the following except:

Production of ribosomes

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Synthesis of lipids

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Synthesis of proteins

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Transportation of molecules to the cell membrane for export

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Solution

The correct option is B Production of ribosomes
Endoplasmic reticulum function is for the synthesis of lipids, synthesis of proteins, transportation of molecules to the cell membrane for export but not for the production of ribosomes. It is done by the nucleolus present within the nucleus.
Hence, the correct answer is 'Production of ribosomes'.

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