Where would you most likely find an integral membrane protein?
A) floating freely in the cytoplasm
B) on the inside surface of the cell membrane
C) on the outside surface of the cell membrane
D) spanning the cell membrane, with parts of the protein visible from both the inside and the outside of the cell

Question

Quizplus · Accepted Answer

Integral membrane proteins are proteins that are embedded into and interact with the lipid bilayer of cell membranes. They often span the entire membrane, with parts of the protein visible from both the inside and outside of the cell. Therefore, the best choice is D. Floating freely in the cytoplasm (A) does not involve membrane proteins, and membrane proteins are not typically found solely on the inside surface of the cell membrane (B) or solely on the outside surface of the cell membrane (C).

Where Would You Most Likely Find an Integral Membrane Protein