In the fluid-mosaic model of the plasma membrane, the phospholipid molecules are oriented so that the ________ heads are facing the outside environment and the ________ tails are facing the interior of the membrane.
A. ectothermic, endothermic
B. hydrophobic, hydrophilic
C. heterotrophic, autotrophic
D. autotrophic, heterotrophic
E. hydrophilic, hydrophobic
Answer: E
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