When a Membrane Is Freeze-Fractured, the Bilayer Splits Down the Middle

question 39

Multiple Choice

When a membrane is freeze-fractured, the bilayer splits down the middle between the two layers of phospholipids. In an electron micrograph of a freeze-fractured membrane, the bumps seen on the fractured surface of the membrane are

• A) peripheral proteins.
• B) phospholipids.
• C) carbohydrates.
• D) integral proteins.
• E) cholesterol molecules.