How Can Protein Molecules Be Positioned in the Plasma Membrane

question 58

Multiple Choice

How can protein molecules be positioned in the plasma membrane?

• A) Protein molecules are buried in the lipid bilayer of the membrane and are not exposed to either the cytoplasm of the extracellular space.
• B) All protein molecules completely span the membrane and face both the cytoplasm and the extracellular space.
• C) Protein molecules can face only the extracellular side, only the cytoplasm, or span the membrane completely and face both the extracellular side and the cytoplasm.
• D) Protein molecules in the membrane only face the cytoplasm.
• E) Protein molecules in the membrane only face the extracellular space.

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