Discussion
Consider the following statements about the fluid mosaic model.
1. Proteins can move laterally within the bilayer.
2. The membrane's two leaflets differ in composition.
3. Phospholipids flip readily between leaflets unaided.
Answer: B
The first two are correct. The third is wrong: flipping a polar head through the hydrophobic core is extremely slow without assistance, and enzymes called flippases carry it out where it is needed, which is how the asymmetry between the two leaflets is maintained.
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