Which cell organelle containing millions of membrane-bound ribosomes is involved in the production, folding, quality control and dispatch of certain proteins?
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 i.e. Rough endoplasmic reticulum.
The Rough Endoplasmic Reticulum (RER) is the cell organelle responsible for the production, folding, quality control, and dispatch of certain proteins. It is termed “rough” because its surface is studded with millions of ribosomes, which are the sites of protein synthesis.
Once synthesized by ribosomes, these proteins enter the RER lumen, where they are folded into their correct 3D shapes, undergo modifications, and are checked for quality. Correctly processed proteins are then packaged into vesicles and sent to the Golgi apparatus for further processing and distribution.
Other Options:
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Peroxisome – Breaks down fatty acids and detoxifies harmful substances, not involved in protein production.
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Mitochondrion – The powerhouse of the cell, generates ATP, not primarily involved in protein synthesis.
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Golgi apparatus – Modifies, sorts, and ships proteins but does not produce them.