Answer:
Protein X would be ultimately present in the subcellular fraction containing membrane fragments
Explanation:
It is possible to trace the synthesis and transport of a membrane protein by the following steps:
1- The amino acids of the membrane protein are joined together in the ribosome to form a polypeptide chain (in this case, the protein X).
2- A signal sequence of the growing polypeptide produces the binding of the ribosome to the membrane of the endoplasmic reticulum (ER) and the insertion of this polypeptide chain into the ER.
3-The protein is released into a vesicle from the ER to be exported to the Golgi complex.
4- The membrane protein is transported by the Golgi complex to the cell membrane by the formation of a secretory vesicle that fuses with the plasma membrane, thus being finally embedded in the lipid bilayer.
