In a phospholipid bilayer, the .a. phosphate groups are hydrophobic. b. fatty acid tails are ionized. c. fatty acid tails are hydrophilic. d. proteins are located only between the two layers. e. phosphate heads are oriented toward the exterior of the cell or toward the cytoplasm.

Option-E

Explanation:

The phospholipid bilayer is the layer which forms the outer membrane of the cell.

The phospholipid layer is amphipathic as it contains both the hydrophilic and hydrophobic portions.

The phospholipid is composed of the glycerol attached to phosphate groups which form head or hydrophilic region and the 3 fatty acid tails which form the hydrophobic portion.

The head or hydrophilic portion is arranged in the layer facing the outer external portions and the inside of the cytoplasm as the lipid layer exist in the bilayer.

Thus, Option-E is correct.

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