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SAT® Subject Test in Biology

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Phospholipid Bilayer of a Cell Membrane

SATBIO-HNVYTF

Which best describes the arrangement of phospholipds in a phospholipid bilayer like that found in a cell membrane?

A

Two layers of phospholipids where the outer layer has the hydrophobic tails facing toward the outside of the cell and the inner layer has the hydrophobic tails facing toward the inside of the cell.

B

Two layers of phospholipids where the outer layer has the hydrophilic heads facing toward the outside of the cell and the inner layer has the hydrophilic heads facing toward the inside of the cell.

C

Two layers of phospholipids where the outer layer has the hydrophilic heads facing toward the outside of the cell and the inner layer has the hydrophobic tails facing toward the inside of the cell.

D

Two layers of phospholipids where the two layers have alternating components such that one pair of components across the membrane are arranged head to tail and the pair adjacent to it are arranged head to tail in the opposite direction.

E

A single layer of phospholipids where the hydrophilic head is facing toward the outside of the cell and the hydrophilic tail is facing toward the inside of the cell.