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NEET AIPMT SOLVED PAPER SCREENING 2005

  • question_answer
                    The main organelle involved in modification and routing of newly synthesized proteins to their destinations is:                                                                                                                                                                               

    A)                 mitochondria                                    

    B)                 endoplasmic reticulum 

    C)                 lysosome                                                            

    D)                 chloroplast

    Correct Answer: B

    Solution :

                    Porter coined the name Endoplasmic Reticulum (ER). It is a network of tubules, vesicles and cisternae within an eukaryotic cell (absent in prokaryotic cells). Two types of ER are recognized on the basis of presence/absence of ribosomes on the wall of the ER.                 (i) Smooth ER?Wall of this ER does not has ribosomes.   Smooth   ER   helps   in   the synthesis of lipid and glycogen,                 (ii) Rough ER?Wall of this ER contains ribosomes. Rough ER is involved in protein synthesis and transfer.                 Protein synthesis takes place in ribosomes attached on wall of ER. Newly formed protein enters within the cavity of rough ER and follows following path:                 Protein \[\to \] cavity of rough ER \[\to \] cavity of smooth ER \[\to \] Golgi membrane \[\to \] lysosomes or transport vesicles or secretory granules.


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