AP Biology Quiz
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CHEMISTRY OF LIFE
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A phospholipid has a glycerol backbone with two fatty acid tails and a phosphate head group. In one variant, the head group includes an additional charged group, increasing its overall polarity; the tails are unchanged. Increased head-group polarity strengthens interactions with water molecules at the membrane surface, while the hydrophobic tails still cluster away from water. When bilayers made from the two variants are compared in water, both remain intact. Which statement best predicts a molecular-level difference caused by the more polar head group?
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