In cell biology, how does a phospholipid differ from a triglyceride in terms of structure and typical role in cells?

• A. A phospholipid has three fatty acid tails and is primarily used for long-term energy storage, whereas a triglyceride has two fatty acid tails and forms membrane bilayers.
• B. A phospholipid contains a sugar ring as its backbone, whereas a triglyceride contains peptide bonds linking fatty acids.
• C. A phospholipid is a polymer of amino acids, whereas a triglyceride is a polymer of nucleotides.
• D. A phospholipid has two fatty acid tails and a phosphate-containing polar head and commonly forms membrane bilayers, whereas a triglyceride has three fatty acid tails and is primarily used for energy storage.

Answer: (D)