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Phospholipid Orientation in Water
Grade Level
AP Biology
APB.128 Phospholipid Orientation in Water
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A student chooses a diagram because it places all phosphate heads on the extracellular side. What is wrong with that choice?
A
It leaves the cytosolic side without hydrophilic heads even though the cytosol is aqueous.
B
All phospholipids point in one direction, so only one membrane surface has heads exposed.
C
Fatty acid tails form a water-facing shell because they are the polar part of the molecule.
D
Phosphate heads avoid water, while fatty acid tails interact directly with the aqueous surroundings.
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