Refer to the following paragraph and accompanying figure to answer the following question(s).
-Where would you most likely find an integral membrane protein?
A) on the inside surface of the cell membrane
B) on the outside surface of the cell membrane
C) floating freely in the cytoplasm
D) spanning the cell membrane, with parts of the protein visible from both the inside and the outside of the cell

Question

Refer to the following paragraph and accompanying figure to answer the following question(s). 
-Where would you most likely find an integral membrane protein?
A) on the inside surface of the cell membrane 
B) on the outside surface of the cell membrane 
C) floating freely in the cytoplasm 
D) spanning the cell membrane, with parts of the protein visible from both the inside and the outside of the cell

Quizplus · Accepted Answer

The figure shows an example of an integral membrane protein (purple) spanning the cell membrane, with parts of the protein visible from both the inside and the outside of the cell. Therefore, the correct answer is D. Integral membrane proteins are embedded within the lipid bilayer of the cell membrane, and they have regions that interact with both the hydrophobic interior of the membrane and the aqueous environment inside and outside the cell.

Refer to the Following Paragraph and Accompanying Figure to Answer