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 N-terminus of protein X to be

A. extracellular.
B. in the lipid bilayer of the plasma membrane.
C. in the lumen.
D. cytoplasmic.


Answer: A

Biology & Microbiology

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