Which statement is true about the plasma membrane?
A. The fluid nature of the membrane is regulated by flip-flopping of the phospholipids from one side of the membrane to the other.
B. The proteins make up the matrix of the membrane.
C. The model can be likened to a sandwich where phospholipids are like the bread and proteins are like the filling.
D. Proteins and phospholipids can move sideways within the plane of the membrane.
Answer: D
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