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In the bilayer, the hydrophobic fatty acid tails are oriented

  • A.inward, facing each other
  • B.outward, facing the water
  • C.randomly in all directions
  • D.parallel to the membrane surface

Answer: A

The tails point into the interior of the sheet and the phosphate heads face the watery environments on either side. This is why the membrane core acts as a barrier to charged and polar substances, which must use a protein if they are to cross at all.

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