Question

CDP-X (where \(X\) is the appropriate alcohol) reacts with 1,2 -diacylglycerol in the primary syntheric pathway for A. phosphatidylcholine. B. phosphatidylinositol. C. phosphatidylserine. D. all of the above. E. none of the above.

Short answer

Answer: All of the above (phosphatidylcholine, phosphatidylinositol, and phosphatidylserine)

Step-by-step solution

Understand CDP-X

CDP-X refers to a cytidine diphosphate (CDP) molecule reacted with the alcohol X. It is a common intermediate in the synthesis of phospholipids.

Understand 1,2-diacylglycerol

1,2-diacylglycerol (DAG) is a molecule containing two fatty acids connected to a glycerol molecule at positions 1 and 2. It is also an intermediate in the synthesis of phospholipids.

Know the primary synthetic pathway for each phospholipid option

A. The primary synthetic pathway for phosphatidylcholine involves the transfer of a choline group from CDP-choline onto the 1,2-diacylglycerol molecule. B. The primary synthetic pathway for phosphatidylinositol involves the transfer of an inositol group from CDP-inositol onto the 1,2-diacylglycerol molecule. C. The primary synthetic pathway for phosphatidylserine involves the enzymatic conversion of phosphatidylethanolamine, which is synthesized through transferring an ethanolamine group from CDP-ethanolamine onto the 1,2-diacylglycerol molecule.

Analyze the reaction of CDP-X with 1,2-diacylglycerol

As stated in Step 3, CDP-X is involved in the primary synthetic pathway for all of the given phospholipids. Therefore, when CDP-X reacts with 1,2-diacylglycerol, it effectively serves as a precursor for the synthesis of phosphatidylcholine, phosphatidylinositol, and phosphatidylserine.

Choose the correct answer

Based on the analysis in Step 4, the correct answer is: D. all of the above.