What is the most common glycerophospholipid class in cell membranes and its variable head group?

• A. Phosphatidylglycerol with a glycerol head group.
• B. Phosphatidylserine with a serine head group.
• C. Phosphatidylethanolamine with an ethanolamine head group.
• D. Phosphatidylcholine with a choline head group.

Answer: (D)