The backbone of a phospholipid molecule is a (blank) molecule, which is attached to two hydrophobic tails and a phosphate head group. 04:40 The Cellular Level of Organization The backbone of a phospholipid molecule is a (blank) molecule, which is attached to two hydrophobic tails and a phosphate head group. Answer: glycerol Learn More : Share this Share on FacebookTweet on TwitterPlus on Google+