Why Does a Phospholipid on the Cytoplasmic Side of the Cell

question 98

Multiple Choice

Why does a phospholipid on the cytoplasmic side of the cell membrane rarely flip to the extracellular side if both environments are polar?

• A)The polar head group cannot pass through the nonpolar interior.
• B)The two sides have different functions and thus the phospholipid would not function properly.
• C)The cytoplasmic phospholipid is too big to pass through the membrane.
• D)The cholesterol does not allow lipids to move.

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