Protein X contains four transmembrane domains,a short N-terminus and a long C-terminus.Following protein synthesis,the N-terminus of the protein faces the lumen (the inside)of the ER.After protein X is transported to the cell surface via exocytosis,you would expect the C-terminus of the protein X to be

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The N-terminus of protein X faces the lumen of the ER, which means that the protein is oriented with its N-terminus inside the cell and its C-terminus outside the cell. When the protein is transported to the cell surface via exocytosis, the C-terminus will remain outside the cell, facing the extracellular space.

Protein X Contains Four Transmembrane Domains,a Short N-Terminus and a Long