MCAT Question of the Day
    •

    Q:

    		 A certain amino acid sequence on a protein intended for secretion from the cell was found to have a role in transporting the protein into the rough ER. By splicing out this sequence, experimenters found that the protein accumulated outside in the cytosol surrounding the rough ER (RER). No effect was found by inserting this same sequence in another protein typically found in the cytosol. What can you say about this amino acid sequence?
    		 

    A

    		 It is necessary and sufficient for import into the RER.

    B

    		 It is necessary but not sufficient for import into the RER.

    C

    		 It is sufficient but not necessary for import into the RER.

    D

    		 It is neither necessary nor sufficient for import into the RER.



    Protein Structure and Function |
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